Condition Analysis
AI-powered assessment using site data and 14-day weather history
Hepburn Crags has had 5 consecutive dry days following moderate rain (4.7mm on Aug 9), with warm temperatures (up to 29.9°C) and steady winds on an exposed hilltop — conditions are well beyond the minimum drying threshold. The rock should be thoroughly dry today and tomorrow, though rain is forecast from August 17 onward.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The exposed hilltop position and consistent 17–23 km/h winds over the past 5 dry days will have significantly accelerated drying across all sectors.
- The west-facing aspect benefits from afternoon and evening sun during summer, complementing the wind exposure for effective drying.
- The heavy 28mm rainfall on July 26 is now 19 days ago and poses no residual concern, and the 6mm on August 4 is 10 days past with excellent drying conditions since.
- Multiple sectors spread across the hillside may have micro-aspects that differ from the predominant west face — sheltered or north-facing boulders could retain slightly more moisture.
Reasoning
Five full dry days since the last meaningful rain (4.7mm on Aug 9), with warm temperatures peaking at 29.9°C and low-to-moderate humidity, mean the rock should be thoroughly dry both internally and externally.
Sustained winds of 14–20 km/h on an exposed hilltop combined with summer temperatures well above 15°C and humidity averaging 72% provide strong drying conditions that comfortably exceed the 48-hour guideline for moderate rain.
With 5 days of drying after only 4.7mm of rain, internal moisture levels should be negligible and structural risk from weakened holds is very low.
Mid-August offers long daylight hours, warm temperatures, and no freeze-thaw risk — this is the optimal season for Fell Sandstone climbing.
Contributing Factors
5
Five full days without meaningful precipitation since the 4.7mm on August 9 far exceeds the 48-hour minimum guideline for moderate rain on porous sandstone.
Temperatures reaching 21–30°C over recent days dramatically accelerate evaporation from porous Fell Sandstone.
Consistent winds of 14–23 km/h across the exposed hilltop position move moist air away from the rock surface, significantly boosting drying rate.
Average humidity of 72% over the last week is moderate — not ideal but far from the 100% RH that would halt evaporation, and offset by the strong wind exposure.
Rain totalling approximately 13.5mm is forecast from August 17–19, which will reset drying clocks and likely make conditions unsuitable for several days.
Recommendations
3
- Climb today or tomorrow (Aug 14–16) to take advantage of the current dry window before rain arrives on August 17.
- Check sheltered or north-facing boulders individually, as these micro-aspects may retain slightly more moisture than the main west-facing sectors.
- Avoid climbing from August 17 onward until at least 48 hours of dry weather with good drying conditions have passed after the forecast rain clears.
Previous Analyses
Likely Safe to Climb
85%
2 days ago
Hepburn Crags has had four consecutive dry days following light rain (4.7mm on Aug 9), with warm temperatures up to 28.7°C today, moderate wind, and an exposed hilltop position that accelerates drying. Conditions should be genuinely dry for climbing today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The exposed hilltop position and consistent wind (14–23 km/h over recent days) significantly aid drying and make this one of the faster-drying Fell Sandstone venues.
- The west-facing aspect receives afternoon and evening sun, meaning the rock benefits from direct solar warming during the hottest part of the day — ideal for today's conditions.
- The 28mm deluge on July 26 was significant but occurred 18 days ago with mostly dry weather since, so deep internal moisture from that event has long dissipated.
- Multiple sectors spread across the hillside may have micro-variations in drying — lower sheltered sections or mossy areas near the base may retain more moisture than upper exposed faces.
Reasoning
The last meaningful rain was 4.7mm on August 9, now four full dry days ago, with only trace amounts (≤0.5mm) in the preceding days — the rock should be thoroughly dry both on the surface and internally.
Four days of drying with temperatures of 17–28°C, humidity averaging ~71%, and steady winds of 14–20 km/h on an exposed hilltop far exceeds the 24–48 hour minimum needed after light rain on Fell Sandstone.
With four dry days and warm summer conditions, internal moisture levels should be well below any threshold for strength reduction or grain loosening, making structural risk negligible.
Mid-summer conditions are optimal for Fell Sandstone climbing, with warm temperatures, long daylight hours, and no freeze-thaw risk whatsoever.
Contributing Factors
5
Four full days without meaningful precipitation since the 4.7mm on Aug 9, comfortably exceeding the two-day minimum drying guideline for porous sandstone.
Temperatures reaching 21–28°C over recent days drive rapid evaporation from the rock matrix.
Consistent winds of 14–23 km/h at this exposed 165m hilltop position significantly accelerate surface and near-surface drying.
Average humidity around 67–71% is not ideal but is well below levels that would impede drying, especially combined with wind and warmth.
41.3mm over the past 28 days is notable but distributed across several light events with good drying windows between them, so cumulative saturation is not a concern.
Recommendations
3
- Conditions are good for climbing today, particularly during the warm afternoon when the west-facing rock receives direct sun.
- Check lower and more sheltered sectors for any lingering dampness, especially near mossy or vegetated areas at the base of boulders.
- Keep an eye on the forecast for Aug 16–18 when light rain returns — plan to make the most of the next two dry days.
Marginal — Assess Conditions
70%
3 days ago
The last significant rain was 6.0mm on August 4th, followed by scattered trace amounts and 4.7mm on August 9th — three days ago. With warm temperatures (up to 25.8°C today), moderate-to-good wind, and the exposed hilltop position, the rock should be largely dry, but the 4.7mm on the 9th and trace precipitation today warrant a visual check on arrival.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Hepburn's west-facing aspect means the crag receives afternoon and evening sun, which combined with its exposed hilltop position provides good drying — but overcast skies today (100% cloud) reduce solar drying benefit.
- The multiple sectors spread across the hillside mean conditions can vary: higher, more exposed blocks will dry faster than any lower sheltered areas near the tree line.
- The 28mm deluge on July 26th was a significant soaking event, but over two weeks of mostly dry weather since then (with only minor interruptions) should have cleared that deep moisture.
- Fell Sandstone at Hepburn has grippy textured surfaces with iron oxide holds that are particularly vulnerable to breakage when damp — always test friction on a low problem first.
Warnings
2
- The 0.1mm trace precipitation forecast around 18:00 today could dampen surfaces — plan to finish climbing before early evening.
- Do not be deceived by surface dryness alone; Fell Sandstone can appear dry while retaining damaging internal moisture after a wet period.
Reasoning
The most relevant rain event is 4.7mm on August 9th (3 days ago), with only trace amounts (0.1mm) today; three days of drying in summer conditions with moderate wind should have removed most surface and near-surface moisture, though some internal dampness may linger in sheltered spots.
The exposed hilltop position and sustained winds of 14–20 km/h from the SW/S over the past three days, combined with warm temperatures (17–25°C), provide strong drying conditions that likely exceed the 48-hour minimum guideline for moderate rainfall on porous sandstone.
With three dry days since the 4.7mm event and warm windy conditions, structural risk from internal moisture is low but not negligible — a cautious visual and tactile check is warranted before committing to harder problems.
Mid-summer conditions are optimal for Fell Sandstone drying, with long days, warm temperatures, and no freeze-thaw risk whatsoever.
Contributing Factors
7
4.7mm fell three days ago, which is moderate enough to require careful drying time assessment on porous Fell Sandstone.
Three full days of largely dry weather since the last meaningful rain exceeds the two-day community minimum for moderate rainfall in good drying conditions.
Temperatures reaching 17–25°C over recent days significantly aid evaporation and internal moisture migration.
Sustained winds of 14–20+ km/h at an exposed 165m hilltop position substantially accelerate surface drying.
0.1mm forecast at 18:00 today is negligible but indicates unsettled air and prevents counting today as fully bone-dry.
100% cloud cover through most of today limits direct solar drying on the west-facing rock.
41.4mm over the past 28 days, including a 28mm event on July 26th, means background moisture levels in the sandstone may be elevated even if surface appears dry.
Recommendations
3
- Visit in the afternoon when temperatures peak and humidity drops to the low-to-mid 40s%, and perform a touch test on multiple holds before committing to climb.
- Start on the highest, most exposed blocks which will have dried fastest; avoid any lower or sheltered sectors where moisture may persist.
- If the ground at the base of the crag feels moist rather than sandy-dry, do not climb — this indicates internal rock moisture remains.
Marginal — Assess Conditions
62%
5 days ago
The most significant rain was 4.7mm on August 9th, just yesterday, with only one full dry day since. While the exposed hilltop position and moderate westerly winds aid drying, the rock has had insufficient time to fully dry internally given Fell Sandstone's high porosity. A careful visual and tactile assessment on arrival is essential before climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Hepburn's west-facing aspect means the crag receives afternoon and evening sun only, so morning visits after recent rain will find the rock slower to warm and dry than south-facing venues.
- The exposed hilltop position at 165m is one of Hepburn's key advantages — persistent wind significantly accelerates surface drying compared to sheltered woodland crags.
- Multiple sectors are spread across the hillside at varying heights and angles, so some blocks and faces will be drier than others — check each problem individually.
- The base of the crag and any moss-covered or north-sheltered faces will retain moisture longest; the ground condition at the base is a reliable proxy for internal rock dampness.
Warnings
2
- Fell Sandstone holds can break without warning when internally damp — the surface may feel dry while the interior remains weakened.
- Do not climb on any face that shows darkened patches, feels cool to the touch, or has damp ground at its base.
Reasoning
4.7mm fell on August 9th (yesterday) and today is the first dry day, meaning the rock has had only ~24 hours of drying — insufficient to guarantee internal dryness in porous Fell Sandstone despite reasonable surface conditions.
Moderate westerly winds (~17–18 km/h) on an exposed hilltop combined with summer temperatures around 16°C are actively drying the surface, but the west aspect limits direct sun to afternoon hours, and humidity around 76% slows evaporation.
With only one dry day after 4.7mm of rain on already-moist rock (6mm on Aug 4, 0.5mm on Aug 6), internal moisture levels are likely still elevated enough to weaken the iron-oxide cemented holds that Fell Sandstone climbing depends on.
Mid-summer temperatures and longer days provide the best drying conditions of the year, which partially compensates for the recent rain, but 41.3mm over the past 28 days indicates the rock has been repeatedly wetted this month.
Contributing Factors
6
4.7mm fell on August 9th with only one dry day elapsed, well short of the recommended 48-hour minimum drying window for moderate rainfall on Fell Sandstone.
41.3mm over 28 days with multiple wetting events (Jul 26: 28mm, Aug 4: 6mm, Aug 9: 4.7mm) means the rock has had repeated saturation cycles without prolonged dry spells.
The exposed 165m hilltop position with 17–18 km/h westerly winds significantly accelerates surface evaporation and is Hepburn's primary drying advantage.
Temperatures of 15–16°C today rising to 20°C+ tomorrow provide reasonable evaporative energy for mid-summer drying.
The west-facing aspect receives direct sun only in the afternoon and evening, providing moderate but not optimal solar drying compared to south-facing crags.
Average humidity of 76% over the past week limits evaporative potential, though today's afternoon humidity drops to the mid-60s which helps.
Recommendations
3
- Wait until tomorrow (August 11th) for a visit — two full dry days with improving conditions and lower humidity will significantly improve confidence in rock dryness.
- If visiting today, carefully check the ground at the base of each boulder and perform a tactile test on holds before committing to any problem.
- Prioritise steep and overhanging problems on the most exposed, wind-facing blocks, as these will have dried fastest; avoid slabby or low-angle faces and any areas with moss or seepage.
Do Not Climb
45%
5 days ago
Today saw 2.4mm of rain, meaning the rock is currently wet. Although tomorrow begins a dry spell with moderate winds, the rock needs at least 24–48 hours of dry weather to recover from today's rain on top of a damp recent period (9.5mm in the last 7 days including 6mm on Aug 4th).
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Hepburn's west-facing aspect means it catches afternoon and evening sun but misses the morning warmth, so drying after overnight dew or morning showers is slower than at south-facing venues.
- The exposed hilltop position is a significant advantage — sustained winds of 15–23 km/h over the coming days will meaningfully accelerate surface and sub-surface drying.
- Multiple sectors are spread across the hillside at varying heights and angles; upper, more exposed blocks will dry considerably faster than lower sheltered ones near the tree line.
- The 28mm downpour on July 26th was a significant saturation event; while subsequent drying has been reasonable, repeated light rain events (Aug 3, 4, 6, and today) have kept the rock from fully drying out internally.
Warnings
2
- Do not climb today or tomorrow — the rock is wet from 2.4mm of rain today and needs a minimum 24–48 hours to dry.
- The recent pattern of repeated wetting means internal moisture levels may be higher than the surface suggests; a dry-looking surface does not guarantee safe conditions on Fell Sandstone.
Reasoning
The rock is currently wet from 2.4mm of rain today, compounded by 6mm on Aug 4th and smaller amounts on Aug 3rd, 5th, and 6th — the Fell Sandstone has had little opportunity to fully dry internally despite brief dry intervals.
Tomorrow and Aug 11th are forecast dry with moderate winds (14–23 km/h) and temperatures around 16–19°C; the west-facing, exposed aspect will benefit from afternoon sun and consistent wind, but 24–48 hours is the minimum needed after today's rain.
Repeated wetting–drying cycles over the past two weeks mean the sandstone has spent considerable time in a partially saturated state, elevating the risk of grain loosening and hold breakage if climbed on before thorough drying.
Summer conditions are generally favourable for drying with longer days and warmer temperatures, but the recent pattern of frequent light rain has prevented the extended dry spell that Fell Sandstone needs.
Contributing Factors
6
Today's 2.4mm of rain has wet the rock surface and begun capillary absorption into the porous sandstone, resetting the drying clock.
Rain on Aug 3rd (0.5mm), 4th (6.0mm), 5th (0.1mm), 6th (0.5mm), and today means the rock has had no sustained dry period longer than two days in the past week.
The exposed position at 165m with consistent 14–23 km/h winds significantly aids evaporative drying compared to sheltered valley crags.
Mid-to-high-teens temperatures support reasonable evaporation rates, though not as effective as warmer spells above 20°C.
Average humidity around 77% over the past week limits the atmosphere's capacity to absorb moisture from the rock surface.
The west aspect receives afternoon and evening sun only, providing moderate but not optimal solar drying — less effective than a south-facing crag.
Recommendations
3
- Wait at least 48 hours from today's rain before visiting — the earliest reasonable window is August 11th, and even then assess conditions carefully on arrival.
- Check the base of the crag for damp ground and feel the rock at lower sections before committing to climb; if either feels damp, walk away.
- If visiting on Aug 11th, prioritise the highest, most exposed blocks and overhanging faces which will have dried fastest; avoid lower sheltered sections near trees.
Do Not Climb
45%
6 days ago
Heavy rain (6mm) fell on August 4th, followed by light drizzle on the 5th, 6th, and today (8th), meaning the rock has not had a clean 48-hour dry window since the last meaningful rainfall. While the exposed hilltop position and moderate winds aid drying, the persistent light moisture inputs and moderate-to-high humidity prevent confident assessment that the rock is dry internally.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The 28mm deluge on July 26th deeply saturated the rock, and although nearly two weeks have passed, repeated light precipitation events since then (July 28, 31, Aug 3, 4, 5, 6, 8) have prevented a sustained drying period from fully clearing internal moisture.
- Hepburn's exposed hilltop position and consistent winds (18–29 km/h recently from SW/W) are among the strongest drying advantages of any Northumberland venue, partially compensating for the frequent light moisture.
- West-facing aspect means the crag only receives afternoon and evening sun, leaving mornings in shade — lower sections and any north-facing sub-buttresses will dry significantly slower.
- Multiple sectors are spread across the hillside at slightly different aspects and elevations; some sheltered lower boulders near the tree line will retain moisture longer than the most exposed upper blocks.
Warnings
2
- Today's trace precipitation (0.1mm) means the rock surface may be freshly damp — do not assume dry conditions.
- The cumulative effect of repeated wetting since July 26th means internal moisture is likely higher than the light recent rainfall figures suggest — surface appearance is unreliable.
Reasoning
The 6mm rain on August 4th was the most significant recent event, and subsequent trace precipitation on the 5th (0.1mm), 6th (0.5mm), and today (0.1mm) has repeatedly re-wetted the rock surface, preventing the sustained drying needed to clear internal moisture from the porous Fell Sandstone.
Despite good wind exposure (19–29 km/h SW/W) and moderate summer temperatures (~17–21°C), the lack of any consecutive dry spell longer than about 36 hours since August 4th means the rock has not had the minimum 48–72 hours of dry weather needed after a 6mm rainfall event.
With repeated wetting cycles over the past two weeks and no extended drying window, internal moisture levels are likely elevated, increasing the risk of hold breakage on the iron-oxide-cemented features that characterise Hepburn's climbing.
Summer conditions are broadly favourable for drying with long days and warm temperatures, but the current unsettled Atlantic pattern with frequent light showers is preventing the rock from reaching a confidently dry state.
Contributing Factors
7
6mm fell on August 4th — heavy enough to require 48–72 hours of dry weather to clear from porous Fell Sandstone, but that dry window has not materialised.
Trace to light precipitation on August 5th, 6th, and today (8th) keeps re-wetting the rock surface and resetting the drying clock.
Sustained winds of 19–29 km/h from SW/W directions hit this exposed hilltop directly, significantly accelerating surface evaporation.
Temperatures averaging 15–21°C provide reasonable evaporative potential, though not exceptional drying heat.
Average humidity of 76% over the last 7 days slows evaporation rates compared to drier conditions.
West-facing rock receives only afternoon and evening sun, giving moderate but not optimal solar drying — better than north-facing but slower than south-facing.
The 28mm event on July 26th deeply saturated the rock, and seven subsequent precipitation days have prevented complete drying, keeping background moisture levels elevated.
Recommendations
3
- Wait for a clear 48-hour dry window before visiting; the forecast suggests August 11–13 may provide this opportunity.
- If visiting soon, check the ground at the base of the boulders — if soil is damp rather than sandy-dry, the rock is almost certainly still wet internally.
- Prioritise the most exposed upper boulders if conditions appear borderline, and avoid any lower sheltered blocks near the tree line.
Do Not Climb
45%
7 days ago
Heavy rain (6mm) fell on 4th August followed by light precipitation on the 5th and 6th, giving only one full dry day so far. Despite the exposed position and decent winds, Fell Sandstone requires at least 48 hours of dry weather after moderate rain, and internal moisture is likely still present.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The 28mm downpour on 26th July will have deeply saturated the rock, and although there was a drying window afterwards, the subsequent rains on 3rd–6th August re-wet the stone before it could fully recover.
- Hepburn's exposed hilltop position and strong westerly/south-westerly winds today (20 km/h) are helping surface drying, but the west-facing aspect means only afternoon and evening sun — limiting solar drying hours.
- Multiple sectors are spread across the hillside at varying angles and sheltering; lower and more sheltered boulders will retain moisture significantly longer than the most exposed blocks.
- The only condition report available is from March and noted dampness from light rain — reinforcing that even minor precipitation is taken seriously at this venue by local climbers.
Warnings
2
- Fell Sandstone loses up to 50% of its compressive strength when wet — holds can break under body weight even when the surface appears dry.
- The 28mm deluge on 26th July followed by repeated re-wetting means deep pore saturation may persist despite surface dryness.
Reasoning
With 6mm on 4th August and trace amounts on the 5th and 6th, the rock has had only one confirmed dry day (today), which is insufficient for Fell Sandstone to dry internally after moderate rainfall.
Today's strong SW winds (~20 km/h) and lower humidity (69%) are aiding surface evaporation, but the west aspect limits direct sun exposure to afternoon hours, and one day is not enough to clear internal moisture from porous sandstone.
Internal moisture from recent rain likely remains above the threshold where significant strength loss occurs — climbing risks hold breakage and permanent damage to the soft Fell Sandstone.
Mid-summer temperatures (~18°C) and long daylight hours are favourable for drying, but the recent pattern of repeated light rain events has kept the rock in a semi-saturated state.
Contributing Factors
6
6mm fell on 4th August with additional trace precipitation on the 5th and 6th, re-wetting rock that was still recovering from the 28mm event on 26th July.
Only one full dry day has elapsed since the last measurable rain (0.5mm on 6th August), well short of the 48-hour minimum for porous sandstone after moderate rain.
Sustained winds of 19–29 km/h over recent days significantly aid surface evaporation at this exposed hilltop site.
Mid-July to early August temperatures averaging around 14–18°C provide reasonable evaporative potential for the season.
Average humidity over the past week has been 76%, slowing evaporation despite the wind exposure.
37mm of rain over the past 28 days with multiple re-wetting events means the rock has rarely had a sustained drying window.
Recommendations
3
- Wait at least one more full dry day (ideally two) before climbing — the rock needs a minimum of 48 hours after the most recent rain to dry internally.
- If visiting, check the base of the crag: if the ground beneath the boulders is still damp, the rock will certainly be too wet to climb safely.
- Consider the more exposed and upper boulders first if conditions improve, as lower and sheltered sectors will retain moisture longest.
Do Not Climb
45%
9 days ago
Heavy rain on July 26 (28mm) was followed by intermittent light precipitation through to today, with 6mm on August 4 and trace amounts on August 3, 5, and 6. With only one fully dry day since the last meaningful rain event and elevated humidity, the rock is unlikely to have dried sufficiently internally despite the exposed position.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The west-facing aspect means the crag receives afternoon and evening sun only, which limits the drying window each day — particularly relevant given overcast conditions forecast today.
- Hepburn's exposed hilltop position and good wind exposure are the main drying advantages here, and recent westerly/south-westerly winds have been blowing directly onto the face, aiding evaporation.
- Multiple sectors are spread across the hillside at varying angles and elevations — lower sheltered boulders will hold moisture significantly longer than higher, more exposed blocks.
- The 28mm deluge on July 26 would have deeply saturated the porous Fell Sandstone, and the repeated trace precipitation since then has repeatedly re-wetted the surface, resetting the drying clock each time.
Warnings
2
- Fell Sandstone loses up to 50% of its compressive strength when wet — holds that feel solid when dry can snap when the rock is internally damp, risking serious injury.
- The rock surface may appear dry this afternoon while remaining saturated internally from the cumulative rainfall; do not be deceived by surface appearance alone.
Reasoning
The 6mm rain on August 4, followed by trace precipitation on August 5 and today (August 6), means the rock surface has been repeatedly re-wetted with no consecutive dry period exceeding one day since the heavy 28mm event on July 26.
Despite strong westerly winds (19–29 km/h) and the exposed hilltop position, the lack of consecutive dry days means drying keeps being interrupted; even the west-facing aspect receiving direct wind cannot overcome the repeated moisture inputs.
With the cumulative 36.8mm over the last 28 days and repeated wetting cycles, internal moisture levels in the high-porosity Fell Sandstone are likely elevated, creating a real risk of hold breakage and grain loosening even if surfaces appear dry.
Summer temperatures (14–22°C) and longer daylight hours are favourable for drying, but the unsettled weather pattern with frequent light showers is preventing the sustained dry spell needed for porous sandstone to dry internally.
Contributing Factors
7
28mm fell on July 26, deeply saturating the porous sandstone, and the rock has not had a sustained dry spell since to fully recover.
Light rain on July 28, 31, August 3, 4, 5, and today has repeatedly re-wetted the rock surface, resetting the drying clock before internal moisture could escape.
Today has recorded 0.3mm of precipitation so far, meaning there are currently zero consecutive dry days — well below the minimum two dry days recommended for porous sandstone.
The exposed site at 165m with recent winds of 19–29 km/h directly onto the west face significantly aids surface evaporation compared to sheltered woodland venues.
Temperatures of 14–22°C provide reasonable evaporative potential, though recent days have been cooler than the July peak.
Average humidity over the last 7 days is 75%, which slows evaporation and limits the rate at which internal moisture can escape the rock.
Humidity drops to 48–50% between 14:00 and 17:00 today with no rain forecast, offering a brief surface drying window — but this is insufficient for internal drying.
Recommendations
3
- Wait for at least 48 hours of completely dry weather with humidity below 70% before climbing — the forecast does not show this window arriving until August 10 at the earliest.
- If visiting the area, check the base of the crag for damp ground and test holds carefully at the lower sections where moisture persists longest.
- Focus on the most exposed, highest blocks first if conditions improve, as these will dry fastest; avoid low-lying sheltered boulders until well into a dry spell.
Do Not Climb
92%
11 days ago
Hepburn Crags received 7.3mm of rain today (with showers continuing into the afternoon) on top of 0.5mm yesterday and intermittent rain over the past week; the rock will be thoroughly wet. With further rain forecast tomorrow and the day after, there is no realistic drying window in the immediate future.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The west-facing aspect means the crag receives afternoon and evening sun, but today's 100% cloud cover and rain through midday eliminates any solar drying benefit.
- The exposed hilltop position normally aids drying via wind, but with SE winds today and high humidity (88–96%), wind is carrying moisture rather than removing it.
- The 28mm deluge on July 26th followed by only sporadic light showers means the rock had partially recovered, but today's 7.3mm plus yesterday's 0.5mm will have re-saturated the porous Fell Sandstone surface.
- Multiple sectors spread across the hillside mean some boulders may dry at different rates, but with active rain today and more forecast, no sector will be reliably dry.
Warnings
2
- Fell Sandstone loses up to 50% of its compressive strength when wet — climbing now risks permanent hold breakage and route damage.
- The rock surface may appear to dry during brief sunny spells this afternoon, but internal saturation from today's rain will persist for at least 48 hours.
Reasoning
The rock is actively wet from 7.3mm of rain today, with showers falling as recently as early afternoon, meaning the Fell Sandstone will be saturated well beyond the critical 1% threshold where significant weakening begins.
No meaningful drying has occurred — rain fell through the morning and around midday, humidity remains above 85%, and the SE wind does not directly ventilate the west-facing crag; the drying clock has not started.
With the rock saturated, Fell Sandstone can lose 10–50% of its compressive strength; climbing now risks hold breakage and permanent damage to the iron oxide features that define routes here.
Mid-summer temperatures (~17–21°C) would normally support reasonable drying, but the persistent unsettled pattern with rain on multiple days this week prevents adequate drying windows from establishing.
Contributing Factors
6
7.3mm total precipitation today with showers through the morning and around midday means the rock is currently wet.
Humidity has been 77–97% throughout the day, preventing any meaningful evaporative drying even during brief dry spells.
0.5mm fell yesterday and 0.2mm on July 31st, so the rock had limited time to dry fully before today's heavier rain.
5.3mm tomorrow and 3.6mm on the 6th mean there is no upcoming dry window to begin meaningful drying.
The exposed hilltop normally accelerates drying, but current SE winds and high humidity negate this advantage for the west-facing crag.
Temperatures of 17–21°C are adequate for drying once rain stops and humidity drops, but this benefit cannot be realised during active wet weather.
Recommendations
3
- Do not climb at Hepburn today or in the next two days — the rock is actively wet and more rain is forecast.
- The earliest possible window may be August 7th if the forecast dry day holds, but check conditions carefully on arrival given the preceding wet days.
- Consider non-porous alternatives such as the Whin Sill venues (e.g. Crag Lough, Peel Crag) which can be climbed sooner after rain, though surfaces will still be slippery until dry.
Do Not Climb
85%
12 days ago
Hepburn Crags has received light but persistent rain throughout today (1.7mm in scattered showers), with a significant 9.8mm rainfall event forecast for tomorrow. The rock is currently wet and conditions will worsen before they improve.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Hepburn's west-facing aspect means it receives no direct morning sun, so overnight and morning moisture lingers well into the day, and today's SE wind offers no direct face-drying benefit.
- The exposed hilltop position is a significant advantage for drying in dry spells, but with rain falling today and more forecast, the wind is currently just driving moisture into the west-facing rock.
- Multiple sectors are spread across the hillside at slightly different aspects and elevations — some sheltered lower boulders will hold moisture considerably longer than exposed upper ones.
- The heavy 28mm rainfall on July 26 was followed by only a brief dry spell before today's rain; deeper pore saturation from that event may not have fully resolved, leaving the rock more vulnerable to rapid re-saturation.
Warnings
2
- Climbing on wet Fell Sandstone causes permanent and irreversible damage to holds — the iron oxide cement dissolves and grains detach, destroying routes for everyone.
- The rock surface may appear to dry quickly during the brief clear spell this afternoon (14:00-18:00) but will remain saturated internally — do not be deceived by surface appearance.
Reasoning
The rock is currently wet from today's 1.7mm of scattered showers spread across the morning and early afternoon, and prior to that the last fully dry period was only two days (August 1-2) following a trace 0.2mm on July 31.
Although the crag had two dry days (Aug 1-2) with moderate westerly winds directly onto the face and temperatures around 17-19°C, today's renewed rain has re-wetted the surface and the SE wind direction offers no direct drying benefit to the west-facing rock.
With the rock currently wet from today's showers and residual internal moisture from the 28mm event on July 26 likely not fully evacuated, climbing now risks hold breakage on the iron oxide-cemented features that define Hepburn's routes.
Mid-summer temperatures (15-19°C) and longer daylight hours favour drying in principle, but the current unsettled spell with repeated light rain and high humidity (84%) is preventing effective drying.
Contributing Factors
6
Today has seen 1.7mm of scattered showers throughout the morning and into early afternoon, with the rock currently wet.
9.8mm forecast for August 4 will thoroughly re-saturate the rock before any meaningful drying from today can occur.
The 28mm downpour on July 26 was a major saturation event, and the brief dry intervals since have been interrupted by trace/light rain on July 28, 31, and today.
Today's humidity averaging 84% with 100% cloud cover severely limits evaporative drying even where the rock is exposed.
The exposed site with moderate winds (19 km/h today) provides good airflow that will accelerate drying once rain stops, but cannot overcome active precipitation.
Rain is forecast on four of the next five days (Aug 4-8), totalling ~19mm, preventing any sustained drying window.
Recommendations
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- Do not climb at Hepburn today or in the coming days — the rock is wet now and the forecast shows no adequate drying window until at least August 9.
- Monitor conditions from August 9 onwards; if the forecast dry day materialises and is followed by further dry weather with moderate wind, conditions may begin to improve.
- If you're in Northumberland and keen to climb this week, consider a non-porous alternative such as the Whin Sill crags (e.g. Crag Lough, Peel Crag) where wet-rock structural damage is not a concern, though take care on potentially slippery surfaces.
Climbing Outlook