Condition Analysis
AI-powered assessment using site data and 14-day weather history
Despite a promising condition report yesterday afternoon and some drying wind, Simonside received 4.6mm of rain on the 12th (much of it in the afternoon/evening), plus 0.6mm today, following a wet week with nearly 10mm total. The NW-facing aspect at 430m with high humidity and overnight temperatures near freezing means insufficient drying time has elapsed for confidence in rock integrity.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The condition report from April 12th was made during the afternoon before the heaviest rain fell (1.2mm at 18:00, 0.5mm at 19:00), so conditions will have deteriorated significantly after that observation.
- At 430m altitude, Simonside is frequently in cloud — with 76% humidity today and overnight lows near 1°C, mist contact can deposit surface moisture even without measurable rain.
- The NW aspect receives minimal direct sun even in April, so solar drying contribution is negligible and the crag relies almost entirely on wind for drying.
- The recent wet pattern (39mm in 28 days including repeated wetting events) means the sandstone's internal moisture content is likely elevated well beyond what surface appearance suggests.
Warnings
3
- The April 12th condition report was made BEFORE the heaviest evening rain — do not rely on it as evidence of current dryness.
- Fell sandstone can appear surface-dry while retaining dangerous internal moisture; the iron oxide holds at Simonside are irreplaceable and break under load when wet.
- Overnight temperatures near 0°C with saturated rock create freeze-thaw risk that causes cumulative structural damage even without climbing.
Reasoning
The rock received 4.6mm on the 12th (with the bulk falling in the late afternoon/evening) and a further 0.6mm today, following a persistently wet spring pattern with 39mm over 28 days — internal saturation is very likely still elevated.
Only ~12 hours have passed since the last significant rain, with overnight humidity at 87-89% and temperatures dropping to 1°C, meaning virtually no effective drying has occurred despite moderate wind.
With repeated wetting cycles through March and April and insufficient drying intervals, the sandstone is at significant risk of strength reduction; the iron oxide holds that define Simonside routes are particularly vulnerable.
Early April at 430m altitude is firmly within Simonside's 'too damp and cold' season — the site notes recommend May-September as the primary climbing window for good reason.
Contributing Factors
8
4.6mm fell on April 12th with the heaviest precipitation (1.2mm, 0.5mm) occurring in the late afternoon and evening, resaturating any surfaces that had begun to dry.
A further 0.6mm today means the rock has had zero consecutive fully dry days since the last significant wetting.
39mm over 28 days with frequent rewetting events means the sandstone's internal moisture content is likely chronically elevated.
The NW-facing aspect receives virtually no direct sun in April, eliminating solar heating as a drying mechanism.
At 430m the crag is frequently in cloud, and today's 76% humidity with southerly wind makes mist contact likely at summit level.
The exposed position with 16km/h southerly wind today provides some drying potential, though insufficient given the short time since rain.
Overnight lows near 1°C with saturated rock create marginal freeze-thaw risk and dramatically slow evaporative drying.
Max of 11.2°C today is adequate for some evaporation but not enough to drive rapid drying of porous sandstone within hours.
Recommendations
3
- Do not climb today — the rock has had less than 24 hours since 4.6mm of rain and conditions are far from adequate for fell sandstone.
- Monitor conditions for a dry window around April 17th, which currently shows 0mm precipitation following a day of drying, though the preceding 4mm on the 15th will need assessment.
- If visiting the area, consider nearby non-porous alternatives such as whinstone crags (e.g. Great Wanney, Crag Lough) which can be climbed sooner after rain, though still check for friction.
Previous Analyses
Do Not Climb
88%
2 days ago
Simonside has received rain today (1.3mm) on top of 3.4mm yesterday and a pattern of frequent precipitation over the past two weeks — the rock will be wet. At 430m on a NW-facing aspect with high humidity and no consecutive dry days, there has been no meaningful drying window and conditions are clearly unsuitable for climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Simonside's 430m altitude means it is frequently in cloud during unsettled spring weather, and orographic mist can deposit significant surface moisture even between recorded rain events.
- The NW aspect receives virtually no direct sun at this time of year, so drying relies almost entirely on wind evaporation — and recent winds, while moderate, have been accompanied by repeated wetting events that reset any drying progress.
- The summit ridge position is highly exposed and at this altitude overnight temperatures have been dropping near or below freezing (e.g. -0.5°C on April 6, -0.4°C on April 7, -1.0°C forecast April 14), creating freeze-thaw risk in saturated sandstone.
- This is primarily a May–September venue; early April visits are often disappointed by persistent dampness, and the long 30+ minute walk-in means conditions cannot easily be scouted without significant commitment.
Warnings
3
- Active freeze-thaw cycling risk: overnight temperatures near 0°C on saturated sandstone causes cumulative structural damage — climbing accelerates this.
- The rock surface may appear deceptively dry in wind while remaining saturated internally; do not trust surface appearance at this crag in current conditions.
- Bird nesting restrictions may be in effect at some Simonside buttresses — check BMC RAD before any visit between February and June.
Reasoning
With rain today (1.3mm), yesterday (3.4mm), and 5.9mm in the last 7 days with zero consecutive dry days, the rock is certainly wet internally and externally — well above the critical 1% saturation threshold for strength loss.
Despite moderate SW winds, there has been no dry window of even 24 hours in the past week; the NW aspect and 430m altitude with ~76% average humidity mean evaporative drying has been negligible between rain events.
The repeated wetting with overnight temperatures near or below freezing creates active freeze-thaw cycling conditions on saturated sandstone, posing serious risk of grain loosening, hold breakage, and cumulative structural damage.
Early April is outside the recommended May–September season for Simonside; low sun angle, frequent cloud immersion at altitude, and cool temperatures all conspire to keep the rock damp for extended periods.
Contributing Factors
8
1.3mm today on top of 3.4mm yesterday means the rock is actively wet with no drying time whatsoever.
Zero consecutive dry days means the sandstone has had no opportunity to begin meaningful drying — the 48-hour minimum required after even light rain has not been met.
40.2mm over the past 28 days in a pattern of repeated wetting events has kept the rock in a near-continuously saturated state.
The NW-facing aspect receives minimal direct sunlight in April, removing the most effective natural drying mechanism and leaving the crag reliant on wind alone.
At 430m, Simonside is frequently in cloud during unsettled weather, depositing additional surface moisture that doesn't appear in rainfall data.
Overnight lows near or below freezing (-0.5°C to -1.0°C recent/forecast) combined with saturated rock create active freeze-thaw damage conditions.
The exposed summit ridge position means wind can aid drying significantly, but this benefit is negated when rain keeps resetting moisture levels.
Daytime highs around 9–12°C are marginal for drying — not cold enough to prevent all evaporation but far from ideal.
Recommendations
3
- Do not visit Simonside today — the rock is wet and climbing would risk both personal safety and permanent damage to this irreplaceable sandstone.
- Wait for a sustained dry spell of at least 3–4 days with moderate wind before considering a visit, given the accumulated moisture from recent weeks.
- Consider lower-altitude, south-facing non-sandstone venues in the region if you need a climbing fix — Simonside is best left until May or later when drying conditions improve reliably.
Do Not Climb
90%
3 days ago
Simonside is receiving rain today (3.8mm) with further rain forecast tomorrow and the day after, making conditions clearly unsuitable. The NW-facing aspect at 430m, combined with a persistently wet spring pattern (40mm in the last 28 days), means the rock will be saturated with no adequate drying window in sight.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- At 430m on a NW-facing ridge, Simonside is frequently engulfed in cloud and orographic mist, which deposits surface moisture even on nominally 'dry' days — actual wetting at the crag is likely worse than valley weather stations suggest.
- The exposed summit position means strong SW/W winds do aid drying significantly, but the NW aspect receives almost no direct sun in early April, so wind is the only meaningful drying mechanism.
- The long walk-in (30+ minutes) means conditions can change during the approach — cloud can roll in quickly at this altitude, re-wetting rock that appeared to be drying.
- This is traditionally a May–September venue; early April visits carry inherent risk of persistent dampness, and the 40mm of rain over the past 28 days will have kept the porous sandstone in a near-continuously saturated state.
Warnings
3
- Active rain today and forecast rain tomorrow make climbing dangerous — wet sandstone loses up to 50% of its compressive strength and holds can snap without warning.
- Freeze-thaw damage risk is elevated: overnight frost forecast on April 14 (-0.8°C) on likely-saturated rock could cause structural deterioration.
- The rock surface may appear dry during windy spells while remaining dangerously saturated internally — do not be deceived by surface appearance at this crag.
Reasoning
Rain today (3.8mm) on top of 3.3mm on April 5th, 1.2mm on April 9th, and scattered light precipitation throughout the past month means the sandstone is almost certainly saturated internally despite brief dry spells.
The best drying window was April 6–8 (three dry days with temperatures up to 18.5°C), but with NW aspect receiving minimal sun and humidity averaging 78%, this was insufficient to dry deeply porous sandstone after repeated wetting — and any progress was negated by rain on April 9th and today.
With near-continuous moisture loading over the past month and overnight temperatures dipping below 0°C on several recent nights (April 2, 6, 7), freeze-thaw cycling on partially saturated rock poses a real risk of hold breakage and grain loosening.
Early April is outside Simonside's recommended climbing season (May–September); low sun angle, frequent cloud immersion, and cool temperatures all conspire against adequate drying at this altitude and aspect.
Contributing Factors
8
3.8mm of rain today is actively wetting the rock, with no drying time elapsed.
40.2mm over 28 days with no sustained dry period longer than 3 days means deep pore saturation is very likely.
The NW-facing aspect receives negligible direct sun in early April, removing the most effective drying mechanism.
At 430m, the crag is frequently in cloud, depositing mist moisture even on days without recorded rainfall.
The exposed ridge position with winds of 31.7 km/h today does accelerate surface drying, though this cannot compensate for active rain.
Several nights recently dropped below 0°C (April 2, 6, 7, 14 forecast) while the rock is likely above the 60% critical saturation threshold, risking cumulative structural damage.
3.5mm forecast tomorrow and 2.1mm the day after means no drying window is available in the near term.
Average humidity of 76% over the past week limits evaporative drying potential even when wind is present.
Recommendations
3
- Do not visit Simonside today or in the coming days — conditions are clearly unsuitable for climbing on this porous sandstone.
- Wait for a sustained dry spell of at least 3–4 days with good wind and ideally some sun before considering a visit, and remember that Simonside is primarily a May–September venue.
- If planning a trip to Northumberland this week, consider non-porous alternatives such as the Whin Sill crags (Crag Lough, Peel Crag) which are more resilient to moisture, though friction will still be reduced.
Do Not Climb
75%
4 days ago
Simonside has received 8.8mm of rain over the past 7 days including 3.3mm on April 5th and further light rain on April 9th (1.2mm) and today (0.4mm), with zero consecutive dry days; combined with its NW aspect, 430m altitude, and high ambient humidity, the rock is very likely still holding internal moisture. The forecast brings further significant rain from tomorrow (5.6mm), making the coming days unsuitable as well.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Simonside's NW aspect at 430m means the crag receives virtually no direct sun at this time of year, so drying relies almost entirely on wind and ambient conditions.
- The summit ridge position frequently sits in cloud, depositing mist-moisture on the rock surface even during nominally 'dry' periods — humidity readings of 77% average confirm this risk.
- The exposed position does provide good wind drying when conditions allow, but the predominantly SW winds have been accompanied by repeated rain fronts rather than sustained dry spells.
- At 430m with overnight lows dropping to -0.5°C on April 6th and -0.4°C on April 7th, recent freeze-thaw cycling on potentially saturated rock adds to structural risk.
Warnings
3
- Climbing on wet Fell Sandstone causes permanent and irreversible damage to the iron oxide holds — this is Northumberland's highest sandstone crag and damage here is especially visible and damaging to classic routes.
- Recent freeze-thaw cycling on saturated rock may have weakened holds that appeared solid last season — test holds carefully even when conditions eventually dry.
- The long 30+ minute walk-in means conditions can change significantly; cloud can roll in rapidly at 430m, depositing moisture on apparently dry rock.
Reasoning
The rock has not had a meaningful dry spell — rain fell on April 3rd (3.5mm), 4th (3.9mm), 5th (3.3mm), 9th (1.2mm), and today (0.4mm), meaning the sandstone has been repeatedly re-wetted and will be holding significant internal moisture despite surface appearances.
Although the exposed ridge benefits from strong winds (up to 53.6 km/h on April 5th), the NW aspect receives negligible direct sun in early April, humidity has averaged 77%, and the brief dry window from April 6–8 (three days) was interrupted by rain on the 9th before full drying could occur.
Recent overnight lows of -0.5°C and -0.4°C on April 6–7 following the heavy rain on April 3–5 create a genuine freeze-thaw risk on rock that was likely above the 60% critical saturation threshold, and the repeated wetting cycle weakens the iron oxide cemented holds.
Early April is firmly outside Simonside's recommended May–September season; the crag notes describe it as 'often too damp and cold outside May–September', and current temperatures averaging 7.1°C with frequent cloud immersion confirm marginal conditions.
Contributing Factors
8
Rain fell on five of the last eight days (April 3–5, 9, and 10), totalling 12.3mm with no chance for the sandstone to fully dry between events.
At 430m on a NW-facing ridge in early April, the crag receives almost no direct sunlight, removing the most effective drying mechanism.
At 430m Simonside frequently sits in cloud, depositing mist-moisture on rock even during nominally dry periods, as evidenced by consistently high humidity readings.
The exposed summit ridge has seen sustained winds of 24–54 km/h which significantly aid surface evaporation when rain stops.
Overnight lows of -0.5°C and -0.4°C on April 6–7 following heavy rain on April 3–5 likely caused damaging freeze-thaw cycles on saturated rock.
Today has seen 0.4mm of precipitation, meaning the current dry-day count is zero and the rock has had no uninterrupted drying window.
High ambient humidity over the past week severely limits evaporative drying, particularly at this altitude where mist is common.
Simonside is primarily a May–September venue and current early April conditions are marginal with low temperatures and frequent damp weather.
Recommendations
3
- Do not climb at Simonside today — the rock has been repeatedly re-wetted with no adequate drying window and further rain is forecast from tomorrow.
- Consider waiting until at least late April or ideally May when longer days, warmer temperatures, and lower humidity will allow proper drying between weather systems.
- If visiting the area, consider nearby whinstone or limestone alternatives that are not structurally damaged by moisture, though friction will still be reduced on damp rock.
Marginal — Assess Conditions
50%
5 days ago
After three fully dry days (Apr 6–8) with warm temperatures and moderate wind following light rain on Apr 5, conditions are promising but uncertain — the NW aspect, high altitude, very high overnight humidity (90%+), persistent cloud cover, and today's 0.5mm precipitation mean surface moisture could easily be present. A visual and tactile check on arrival is essential before committing to climb.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- At 430m with NW aspect, Simonside is frequently in cloud or mist, and the overnight hourly data shows humidity consistently above 85% with 100% cloud — condensation and mist-wetting of the rock surface is very likely even without recorded rainfall.
- The exposed summit ridge position means the moderate SW winds (12–17 km/h yesterday afternoon) will have aided surface drying, but wind dropped to under 10 km/h overnight when humidity was highest, reducing its effectiveness.
- The 75.7mm of precipitation over the past 28 days represents a very wet March, and the porous sandstone at this altitude with minimal sun exposure may still carry residual internal moisture from repeated soakings.
- Today's 0.5mm precipitation, though light, resets the drying clock on a crag that was only marginally dry — arriving climbers should check the base of the crag for moisture as a proxy for internal rock condition.
Warnings
2
- Overnight frost on recently wetted sandstone may have caused freeze-thaw weakening — test holds carefully, especially flakes and edges, as they may be more fragile than usual.
- At 430m with NW aspect, Simonside is frequently immersed in cloud even when lower ground is dry — the rock may be mist-wetted regardless of rainfall records.
Reasoning
Three dry days (Apr 6–8) following 3.3mm on Apr 5 have allowed surface drying, but overnight humidity consistently above 85% at altitude with near-total cloud cover means condensation or mist-wetting is very likely, and today's 0.5mm adds fresh surface moisture.
The NW aspect receives minimal direct sun even in April, so drying has relied almost entirely on wind and temperature; warm afternoons (up to 18.5°C on Apr 8) and moderate wind helped, but the low overnight temperatures (down to -0.5°C on Apr 6–7) and high humidity severely limited overnight drying.
With 75.7mm of rain in the last 28 days and overnight frost events on Apr 6 and 7 when the rock likely still held internal moisture from Apr 5 rain, there is moderate freeze-thaw risk and the sandstone may have sustained some cumulative weakening.
Early April is marginal for Simonside — the crag is described as primarily a May–September venue, and current conditions with overnight frosts, frequent cloud immersion, and high humidity are typical of the shoulder season when reliable drying is difficult to achieve.
Contributing Factors
8
April 6–8 were completely dry with warm afternoon temperatures up to 18.5°C, providing reasonable surface drying time after the 3.3mm on April 5.
Today's 0.5mm of rain, though very light, re-wets the rock surface and partially resets the drying clock.
Overnight humidity reached 90–98% with near-total cloud cover at crag altitude, strongly suggesting mist-wetting or condensation on the rock surface.
The NW-facing aspect receives almost no direct sun even in April, meaning drying depends almost entirely on wind and ambient temperature.
The summit ridge exposure means moderate winds (currently 32 km/h SW) can strip surface moisture effectively when humidity allows.
75.7mm over 28 days represents a very wet period, and porous sandstone at 430m altitude with poor sun exposure may retain significant internal moisture.
Minimum temperatures of -0.5°C on Apr 6 and -0.4°C on Apr 7, occurring while the rock likely still held moisture from Apr 5 rain, create freeze-thaw damage risk.
Early April is outside Simonside's primary May–September climbing season, when reliable drying conditions are more typical.
Recommendations
3
- Perform a thorough visual and tactile check on arrival — press your palm against the rock in shaded lower sections and check the base of the crag for any dampness before climbing.
- If the rock surface feels at all cool and clammy, or if there is any visible moisture at the crag base, do not climb — the interior will be significantly wetter than the surface suggests.
- Consider waiting for a more sustained dry spell; the forecast shows potential improvement April 12–13, which could provide the extended drying needed after this wet period.
Do Not Climb
55%
6 days ago
Despite two dry days (April 6–7), the rock at Simonside is unlikely to be fully dry internally given the high-altitude NW aspect, very high overnight humidity (93–99%), recent frequent rain events (11mm in the last 7 days, 76.7mm in the last 28 days), and light precipitation today. The cumulative moisture loading through March and early April, combined with near-saturation overnight conditions at altitude, means internal moisture almost certainly persists.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Simonside at 430m is frequently in cloud — the overnight hourly data shows humidity reaching 97–99% with 100% cloud cover, meaning mist/condensation likely deposited surface moisture on the rock even during the nominally 'dry' days.
- The NW aspect receives virtually no direct sun at this time of year, so solar drying contribution is negligible and the rock relies almost entirely on wind evaporation.
- The walk-in is 30+ minutes, so conditions cannot be easily re-assessed mid-day; commit to the journey only if confident conditions are good.
- March saw exceptionally heavy cumulative rainfall (76.7mm over 28 days) including a 35mm event on March 12 and 10mm on March 24 — deep internal moisture from this prolonged wet period will take extended dry spells to fully dissipate.
Warnings
3
- Overnight frost with internally wet sandstone creates active freeze-thaw damage — climbing risks accelerating permanent hold and surface deterioration.
- The rock surface may appear dry after yesterday's warm afternoon, but interior moisture from weeks of heavy rain is almost certainly present — do not be deceived by surface conditions.
- Simonside is outside its recommended season (May–September); conditions at 430m NW-facing in early April are inherently poor for sandstone.
Reasoning
The rock has had only two fully dry days since the last significant rain (4.8mm on March 29, then lighter falls on April 1, 3, 4, and 5), but overnight humidity at 93–99% with cloud immersion means the surface has been re-wetted by condensation, and the massive cumulative rainfall of 76.7mm over 28 days ensures deep internal moisture persists.
Wind has been light (12–16 km/h) over the two nominally dry days (April 6–7), and with NW aspect receiving no direct sun, effective drying has been minimal — far short of the 48–72+ hours of genuinely favourable drying conditions needed after the repeated soakings this site has received.
With high porosity sandstone likely still holding significant internal moisture from weeks of heavy rain, there is a meaningful risk of hold breakage and grain loosening even if the surface appears dry.
Early April is outside Simonside's recommended May–September season; overnight frost (min −0.5°C on April 6, −0.4°C on April 7) combined with internal moisture raises freeze-thaw concerns, and conditions at 430m are inherently poor at this time of year.
Contributing Factors
8
76.7mm over 28 days with frequent rain events means the sandstone has been repeatedly saturated, building deep internal moisture that requires extended dry periods to dissipate.
Humidity reached 97–99% overnight with 100% cloud cover at altitude, almost certainly depositing condensation on the rock surface and preventing overnight drying.
The NW-facing aspect receives essentially no direct sunlight in early April, removing the most effective natural drying mechanism.
Wind speeds on the two dry days (April 6–7) were only 12–16 km/h — well below the stronger winds that Simonside needs to compensate for its lack of solar drying.
Minimum temperatures of −0.5°C and −0.4°C on April 6–7 with likely internal moisture above the 60% critical saturation threshold create active freeze-thaw damage risk.
0.3mm forecast today resets any drying progress and adds fresh surface moisture to already damp rock.
At 430m, temperatures are lower and cloud immersion is frequent, significantly slowing drying compared to lower-altitude sandstone crags.
Temperatures reached 16.6°C with humidity dropping to 45% during the afternoon of April 7, providing a few hours of effective drying.
Recommendations
3
- Do not climb at Simonside today — the combination of cumulative rainfall, overnight condensation, NW aspect, and high altitude means internal moisture almost certainly persists despite surface appearance.
- Wait for a sustained dry spell of at least 3–4 days with good wind and low humidity before visiting; monitor conditions carefully as the site enters its usable season from May onward.
- If keen to climb sandstone today, consider lower-altitude, south-facing Northumberland crags that will have dried more effectively.
Do Not Climb
45%
8 days ago
Despite one dry day today, 3.3mm of rain fell yesterday (April 5th) following a persistently wet period — 12.1mm in the last 7 days and 76.9mm over 28 days. At 430m on a NW-facing aspect with high average humidity (79%), the rock is very unlikely to have dried adequately in just one day, and surface-dry appearance would be misleading.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Simonside's 430m summit ridge is frequently in cloud even on nominally dry days, meaning mist contact can keep the rock surface wet independently of rainfall — check conditions are clear before committing to the long walk-in.
- The NW aspect receives virtually no direct sun at this time of year, so drying relies almost entirely on wind; yesterday's strong westerlies (53 km/h) helped but today's lighter winds (15.5 km/h) are much less effective.
- The long walk-in (30+ minutes) means conditions can change en route and it's a significant commitment — if cloud rolls in at summit level the trip may be wasted.
- Simonside is generally considered a May–September venue; early April conditions at this altitude are marginal at best, with overnight temperatures near or below freezing raising freeze-thaw concerns on recently wetted rock.
Warnings
3
- The rock surface may appear dry while remaining internally saturated from the cumulative 76.9mm of rain over the past month — do not be deceived by surface appearance.
- Overnight temperatures near freezing combined with high internal moisture create active freeze-thaw conditions that weaken holds and damage the rock structure.
- Simonside is generally regarded as a May–September venue; early April visits carry elevated risk of encountering unsuitable conditions.
Reasoning
The rock received 3.3mm of rain yesterday, 4.8mm on March 29th, and has been subjected to 76.9mm over 28 days — at 430m NW-facing with 79% average humidity, internal moisture levels are almost certainly still elevated despite today's dry spell.
Only one full dry day has elapsed since yesterday's rain; while yesterday's strong winds (53.6 km/h) would have aided surface drying, the NW aspect and high altitude mean evaporative drying is slow, and the lighter winds today (15.5 km/h) are far less effective — a minimum of 48 hours is needed even in good conditions after this level of precipitation.
The cumulative 76.9mm over 28 days with frequent wetting cycles means the sandstone's pore network is likely substantially saturated, posing real risk of hold breakage and grain loosening even if the surface feels dry to the touch.
Early April at 430m is marginal for Fell Sandstone climbing — overnight temperatures have dropped below freezing on several recent nights (including -0.2°C on April 2nd and -1.4°C on March 26th), creating freeze-thaw stress on moisture-laden rock during a period when drying capacity is still limited.
Contributing Factors
8
3.3mm fell on April 5th across scattered showers, with only one dry day elapsed since — far short of the minimum 24–48 hour drying window needed even in ideal conditions.
76.9mm over 28 days represents a persistently wet period that keeps the porous sandstone's internal moisture elevated well beyond what surface appearance suggests.
The NW-facing aspect receives negligible direct sunlight in early April, removing the most effective drying mechanism and leaving the rock reliant on wind alone.
At 430m, the crag is frequently enveloped in cloud or mist, which deposits surface moisture even on nominally rain-free days and maintains high local humidity.
Yesterday's strong westerly winds (53.6 km/h) and the exposed position will have accelerated surface evaporation, though today's winds are much lighter at 15.5 km/h.
Today's maximum of 12.7°C is reasonable for evaporation, though overnight lows near 0.9°C mean drying effectively pauses overnight.
Multiple recent nights below or near freezing (April 2nd: -0.2°C, March 26th: -1.4°C) combined with elevated pore saturation from heavy rainfall creates cumulative freeze-thaw damage risk.
Average humidity over the last 7 days is 79%, and overnight humidity has been above 80%, significantly slowing the drying process especially on a shaded NW face.
Recommendations
3
- Do not climb today — one dry day after yesterday's rain and a very wet month is insufficient drying time for Fell Sandstone at this altitude and aspect.
- Wait for at least 48 hours of continuous dry weather with good wind before considering a visit; the forecast suggests April 9th or later may offer a window if the light showers on the 8th stay minimal.
- Consider lower-altitude, south-facing Northumberland crags (e.g. Kyloe-in or Bowden Doors) which will dry significantly faster than Simonside in current conditions.
Do Not Climb
90%
9 days ago
Simonside received 3mm of rain today on top of a very wet recent period (76.6mm in 28 days, 11.9mm in the last 7 days alone), and the rock has had zero consecutive dry days. At 430m with a NW aspect, drying conditions are extremely poor despite strong winds, and the sandstone will be thoroughly saturated internally.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Simonside's 430m summit altitude means it is frequently in cloud during spring, adding surface moisture from mist even between rain events — this has likely kept the rock damp throughout the recent wet spell.
- The NW aspect receives virtually no direct sun at this time of year, so drying relies almost entirely on wind evaporation, which is insufficient to overcome the cumulative moisture load from 76.6mm of rain in 28 days.
- The exposed ridge position does provide strong wind drying (53.6 km/h today from the W), but wind alone cannot dry deeply saturated porous sandstone — internal moisture will persist for days.
- The long 30+ minute walk-in means conditions at the crag may differ from conditions at the car park; at altitude, temperatures will be several degrees lower and cloud contact more likely.
Warnings
3
- Climbing on saturated Fell Sandstone causes permanent, irreversible damage to holds — the iron oxide features climbers depend on will break under reduced compressive strength.
- Freeze-thaw cycles are actively damaging saturated rock at this altitude with overnight temperatures near 0°C — even without climbing, the rock is under stress.
- Cloud contact at 430m can create invisible surface moisture that makes holds dangerously slippery even if rain has stopped.
Reasoning
The sandstone is almost certainly saturated internally given 76.6mm of rain over 28 days with frequent top-ups (most recently 3mm today), and the high-porosity Fell Sandstone at this altitude will have absorbed moisture deeply throughout this prolonged wet period.
Despite strong SW/W winds across the period, the NW aspect and 430m altitude severely limit drying; with rain falling today and no consecutive dry days accumulated, there has been no meaningful drying window to begin reducing internal moisture.
The rock is at very high risk of hold breakage — prolonged saturation means compressive strength is likely reduced by 30%+ across the crag, and the iron oxide holds that climbers rely on are particularly vulnerable when the surrounding sandstone is weakened.
Early April is outside Simonside's recommended May–September climbing season; low average temperatures (6.6°C over the last week), frequent cloud contact at altitude, and overnight frosts (min -0.2°C on April 2nd, 0.2°C forecast tomorrow) add freeze-thaw risk to already saturated rock.
Contributing Factors
7
3mm fell today with no dry days accumulated, on top of 11.9mm in the last 7 days and 76.6mm in 28 days — the rock is deeply saturated.
The NW-facing aspect receives almost no direct sun in early April, eliminating solar drying as a factor and leaving the crag reliant solely on wind evaporation.
At 430m the crag is frequently enveloped in cloud and mist, which deposits surface moisture and maintains high humidity at the rock face even between rainfall events.
Sustained strong winds (53.6 km/h today, averaging 30+ km/h recently) do aid surface evaporation, but cannot overcome the deep internal saturation from prolonged rain.
Overnight lows near or below 0°C (1.5°C today, 0.2°C forecast tomorrow) combined with saturated rock create active freeze-thaw damage risk, especially on the exposed summit ridge.
Simonside is recognised as a May–September venue; April conditions are typically too cold and damp for safe sandstone climbing at this altitude.
The 28-day total of 76.6mm with rain falling on the majority of days means the sandstone has had no opportunity to dry out at depth — internal moisture likely persists throughout the rock mass.
Recommendations
3
- Do not climb at Simonside today — the rock is saturated from today's rain and the prolonged wet period, and climbing risks permanent damage to holds and routes.
- Wait for at least 3–4 consecutive dry days with good wind before considering a visit, and ideally wait until May when temperatures and drying conditions improve significantly.
- If visiting the area, consider non-porous alternatives such as whinstone crags (e.g. Great Wanney, Crag Lough) which do not suffer structural damage when damp, though friction may still be reduced.
Do Not Climb
88%
10 days ago
Simonside is currently receiving rain today (3.1mm) following a very wet recent period (72.8mm in 28 days, 12.9mm in the last 7 days), and the rock will be saturated. Despite strong winds, the NW aspect at 430m altitude, high humidity, and ongoing precipitation make conditions clearly unsuitable for climbing on fell sandstone today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- At 430m with a NW aspect, Simonside is frequently immersed in cloud, meaning mist and condensation can keep the rock surface damp even during nominally 'dry' periods — surface-dry appearance is particularly unreliable here.
- The exposed summit ridge position means the strong SW winds (49 km/h today) will aid drying once rain stops, but at this altitude wind also drives moisture directly into the rock face.
- The heavy 35.1mm event on March 12 followed by repeated smaller rain events means the sandstone has had almost no opportunity to fully dry out internally over the past month — deep saturation is very likely.
- March is outside the recommended May–September climbing season for Simonside; temperatures regularly dropping below freezing overnight (min -0.2°C on April 2) mean freeze-thaw cycles are actively damaging saturated rock.
Warnings
3
- Climbing on saturated fell sandstone causes permanent, irreversible damage to holds — the 'Love the rocks' ethic must take priority.
- Freeze-thaw cycles are actively occurring at this altitude with overnight temperatures near 0°C; saturated sandstone is at risk of structural failure even without climbing.
- The rock surface may appear dry before the interior has drained — do not be deceived by apparent surface dryness at Simonside given the recent saturation.
Reasoning
The rock is almost certainly saturated internally given 72.8mm of rain over 28 days with only brief dry spells, topped by 3.1mm of rain today — at this altitude and NW aspect, deep moisture will have accumulated with no adequate drying window.
Although strong SW winds are present, the NW-facing aspect receives virtually no direct sun in early spring, and humidity has averaged 79% over the past week, meaning evaporative drying has been extremely slow despite wind exposure.
With prolonged saturation and overnight temperatures oscillating around freezing (min -0.2°C on April 2, 1.9°C today), the sandstone is at significant risk of freeze-thaw damage and hold breakage — climbing would compound structural degradation.
Early April is outside Simonside's recommended climbing season (May–September); low sun angle, frequent cloud immersion, and overnight frost all conspire to keep the high-altitude sandstone in poor condition.
Contributing Factors
8
3.1mm of precipitation today means the rock surface is currently wet and absorbing additional moisture.
72.8mm over 28 days with no dry spell longer than 4–5 days means the sandstone is deeply saturated internally, far beyond surface dampness.
The NW-facing aspect receives almost no direct sun in early April, severely limiting solar-driven evaporation and surface drying.
At 430m, Simonside is frequently in cloud, adding surface moisture from mist even without recorded precipitation.
Winds of 49 km/h today and sustained strong winds forecast will significantly aid surface drying once precipitation stops.
Overnight temperatures have been near or below freezing repeatedly (min -0.2°C on April 2), creating active freeze-thaw cycling in saturated sandstone.
Average humidity of 79% over the past week limits evaporative drying capacity even when wind is present.
Simonside is primarily a May–September venue; early April conditions are typically too cold and damp for fell sandstone to be in climbable condition.
Recommendations
3
- Do not climb at Simonside today — the rock is wet from today's rain and deeply saturated from the past month's precipitation.
- Wait for the dry spell forecast from April 6–8 and reassess after at least 48–72 hours of dry, breezy weather before considering a visit.
- Consider lower-altitude, south-facing alternatives or non-porous rock types (such as whinstone at Kyloe or Great Wanney) if you need to climb this weekend.
Do Not Climb
90%
11 days ago
Simonside received 5mm of rain today on top of a very wet recent period (73mm in 28 days, 11.7mm in the last 7 days), and the rock will be thoroughly saturated. The NW-facing, high-altitude aspect with 430m elevation means drying will be extremely slow even with the exposed position, and conditions are clearly unsuitable for climbing today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- At 430m with a NW aspect, Simonside is frequently in cloud even when lower ground is dry — mist-borne moisture can keep the rock damp independently of rainfall.
- The exposed summit ridge position means strong SW/W winds do reach the crag face well, which is the primary drying mechanism here since direct sun is minimal on the NW aspect.
- The 35mm deluge on March 12th followed by repeated smaller rainfall events means the sandstone has had almost no opportunity to fully dry out internally over the past three weeks.
- March overnight temperatures have dropped below freezing on several occasions while the rock was likely still damp, raising cumulative freeze-thaw damage concerns for the season.
Warnings
3
- Climbing on wet fell sandstone causes permanent, irreversible damage to holds — the NMC ethic of 'Love the rocks' means waiting is essential.
- Freeze-thaw cycles this spring may have already weakened some holds; test holds carefully even when conditions eventually improve.
- At 430m the crag may be in cloud even when the valley appears dry — always check conditions at the crag itself, not from the car park.
Reasoning
The rock is almost certainly saturated: 5mm fell today, 4.8mm fell on March 29th, 10mm on March 24th, and 35mm on March 12th — the sandstone has been subjected to repeated wetting with insufficient drying windows between events.
Despite the exposed position and moderate SW winds (24–42 km/h recently), the NW aspect receives negligible direct sun and the high humidity (averaging 78% over the last week) severely limits evaporative drying between rain events.
With 73mm of rain in 28 days and repeated wetting-drying-freezing cycles (multiple overnight frosts while rock was damp), there is elevated risk of hold breakage and grain loosening on this high-porosity fell sandstone.
Early April at 430m altitude is still firmly in the marginal season for Simonside — the crag is realistically a May–September venue, and current conditions with overnight temperatures near or below freezing confirm this is too early in the year for reliable conditions.
Contributing Factors
7
5mm of rain today adds to 11.7mm in the last 7 days and 73.3mm over 28 days, meaning the sandstone has been repeatedly saturated with no adequate drying window.
The NW-facing aspect receives almost no direct sunlight, removing the most effective drying mechanism and leaving wind as the sole significant driver of evaporation.
At 430m, Simonside is frequently in cloud, which deposits surface moisture on the rock even during nominally dry periods and keeps humidity near 100% at the crag face.
The exposed summit ridge benefits from strong winds (averaging 25+ km/h recently from SW/W), which is the primary drying factor for this crag and will aid surface drying once rain stops.
Average humidity of 78% over the last week significantly slows evaporative drying, particularly at this altitude where temperatures are lower than valley readings.
Multiple overnight frosts (sub-zero on Mar 6, 7, 8, 26, and Apr 2) while the rock was likely damp raise concerns about cumulative freeze-thaw weakening of holds.
There have been zero consecutive dry days heading into today, meaning no uninterrupted drying window has begun — fell sandstone after heavy rain needs 48–72+ hours minimum.
Recommendations
3
- Do not climb at Simonside today — the rock is wet from today's rain and saturated from weeks of repeated rainfall.
- Wait for a sustained dry window of at least 3 days with wind before considering a visit, and even then verify conditions on arrival by checking the base of the crag for dampness.
- Consider Simonside primarily from May onwards when temperatures and sun angles improve; for sandstone climbing sooner, lower-altitude south-facing crags with better aspect will dry far more quickly.
Climbing Outlook