Condition Analysis
AI-powered assessment using site data and 14-day weather history
Hepburn Crags has received repeated rainfall over the past two weeks (43.4mm in 28 days, 10.5mm in the last 7 days) with rain again today (2.1mm) and more forecast every day through June 21st. The rock has had no meaningful drying window and will remain saturated internally despite any brief dry spells between showers.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The west-facing aspect means the crag only receives afternoon and evening sun, which limits solar drying compared to south-facing venues — and today's 100% cloud cover eliminates even that advantage.
- Hepburn's exposed hilltop position is normally a significant drying asset, but the persistent high humidity (77% average over the last week, 88% today) severely reduces the effectiveness of wind-driven evaporation.
- The prolonged wet pattern since early June (rain on 8 of the last 15 days totalling ~34mm) means the sandstone's pore network is likely deeply saturated, requiring multiple consecutive dry days to recover — which the forecast does not provide.
- Multiple sectors spread across the hillside at different heights and angles mean conditions will vary, but given the cumulative moisture loading even the most exposed upper sections are unlikely to be adequately dry.
Warnings
2
- Climbing on saturated Fell Sandstone causes permanent, irreversible damage to holds — the iron oxide features that define Hepburn's routes cannot regenerate once broken.
- The rock surface may appear dry during the brief afternoon dry window today, but internal saturation from weeks of repeated wetting means holds remain critically weakened.
Reasoning
Rain fell overnight and into the early hours today (2.1mm total), following 5.7mm on June 11th and further showers on the 8th, 9th, 10th, and 15th — the sandstone has had no window of more than 3 consecutive dry days since late May and is almost certainly saturated internally.
Despite the exposed position, the combination of high humidity (77–88%), overcast skies (100% cloud), and only moderate winds means evaporative drying has been minimal; the brief 3-day dry window (June 12–14) with good westerly winds would have begun surface drying but was insufficient to dry the rock through after the heavy rain on June 11th.
With repeated wetting cycles and no adequate drying periods, the Fell Sandstone's iron oxide holds are at significant risk of breakage — compressive strength is likely reduced by 30%+ given the probable internal saturation state.
Although it is early summer with reasonable temperatures (14–18°C), this has been an unusually wet spell for June in Northumberland, and the forecast shows no sign of the sustained dry weather needed for safe conditions.
Contributing Factors
6
Rain has fallen on 8 of the last 15 days totalling approximately 34mm, with no drying window longer than 3 days, keeping the porous sandstone deeply saturated.
2.1mm fell today with further rain forecast every day from June 17–21 (totalling 11mm), preventing any meaningful drying.
Average humidity of 77% over the last week and 88% today severely limits evaporative drying even with wind.
The exposed setting at 165m normally accelerates drying via wind, but this advantage is largely negated by the persistent humidity and lack of dry days.
Temperatures around 14–18°C are warm enough to support some evaporation, though well below the recent warm spell of late May (22–27°C).
Complete overcast conditions eliminate solar heating of the rock surface, which is particularly limiting for this west-facing crag that relies on afternoon sun.
Recommendations
3
- Do not climb at Hepburn today or in the coming days — the Fell Sandstone is almost certainly saturated internally and holds are at risk of breakage.
- Wait for a sustained dry spell of at least 3–4 days with humidity below 70% and some wind before reassessing; the forecast suggests this is unlikely before late June at the earliest.
- If you are in the area and want to climb, consider a non-porous alternative such as the Whin Sill venues (e.g. Crag Lough, Peel Crag) where wet-rock structural damage is not a concern, though slippery conditions still apply.
Previous Analyses
Do Not Climb
85%
2 days ago
Hepburn Crags has received repeated rainfall over the past two weeks (42mm in 28 days, 12mm in the last 7 days alone) with the most recent dry spell being only 3 days (June 12–14) before today's rain. The rock is almost certainly still holding internal moisture from the prolonged wet period, and further rain is forecast every day through June 20, making meaningful drying impossible.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The west-facing aspect means the crag only receives afternoon and evening sun, which limits solar drying compared to south-facing venues — particularly relevant during overcast spells like the current pattern.
- The exposed hilltop position and recent strong winds (24–32 km/h on June 12–13) will have helped surface drying during the brief 3-day dry window, but this is insufficient to clear internal moisture from a prolonged wet spell.
- Multiple sectors are spread across the hillside at different angles and elevations; lower and more sheltered sectors will be significantly damper than upper exposed faces.
- The Forestry Commission car park approach passes through wooded and grassy terrain — if the ground is soft and damp on the walk in, expect the rock to be worse.
Warnings
2
- Climbing on wet Fell Sandstone causes permanent, irreversible damage to holds — iron-oxide cemented features can snap off when the rock is weakened by moisture.
- The rock surface may appear dry while the interior remains saturated; do not be misled by surface appearance after a brief dry spell following prolonged rain.
Reasoning
With 12mm of rain in the past 7 days, only a brief 3-day dry window (June 12–14) before today's 1.2mm rain, and 42mm over 28 days, the rock's internal moisture content is almost certainly well above the critical threshold for safe climbing.
The 3-day dry spell (June 12–14) with strong westerly winds and moderate temperatures offered some surface drying, but average humidity around 70–75% and cool temperatures (13–18°C) limited evaporation depth, and today's rain has re-wetted the surface.
Fell Sandstone loses up to 50% compressive strength when wet, and the repeated wetting cycles over the past two weeks mean iron-oxide cemented holds are at significant risk of breakage — climbing now risks permanent route damage.
Early June in Northumberland often brings unsettled Atlantic weather; the current pattern of frequent light-to-moderate showers with limited drying windows is typical and conditions are unlikely to improve until a sustained high-pressure system establishes.
Contributing Factors
7
42mm over 28 days and 12mm in the last 7 days with repeated wetting events have kept the rock saturated through multiple cycles.
The only dry spell was 3 days (June 12–14) which is inadequate to dry Fell Sandstone after cumulative heavy rainfall, especially with humidity averaging 70%+.
1.2mm of rain today (forecast late evening) re-wets any surface drying that occurred during the brief dry window.
Rain is forecast every day from June 16–20 (totalling ~10mm), preventing any meaningful drying for at least the next 5 days.
The hilltop exposure and moderate-to-strong winds help surface evaporation when dry weather does arrive, but cannot overcome continuous re-wetting.
Average temperatures around 11–15°C over the past week are well below summer norms and slow internal drying significantly.
Humidity averaging 75% over the last 7 days (and forecast 78–88%) severely limits evaporation rates from the rock surface.
Recommendations
3
- Do not climb at Hepburn Crags until there has been at least 48–72 hours of continuous dry weather with humidity below 70% — this is unlikely before late June at the earliest given current forecasts.
- If visiting the area, consider non-porous alternatives such as whinstone venues (e.g. Great Wanney, Crag Lough) which tolerate damp conditions far better than Fell Sandstone.
- Check the ground at the base of the crag before any future visit — if the soil is not sandy-dry, the rock is almost certainly still holding damaging levels of internal moisture.
Marginal — Assess Conditions
55%
3 days ago
After a persistently wet period through early June (41mm in 28 days), the rock has had only about 2.5 dry days since the last rain on June 11 (5.7mm). While the exposed hilltop position and moderate winds have aided drying, the cumulative moisture loading from repeated rain events and relatively high humidity mean internal dampness is still plausible — a visual check on arrival is essential.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Hepburn's west-facing aspect receives afternoon and evening sun only, which limits the peak drying hours compared to south-facing crags and means lower, shaded sections may retain moisture longer.
- The exposed hilltop position is a significant advantage here — strong winds (24–32 km/h from W on June 12–13) will have substantially accelerated surface and near-surface drying over the last two days.
- Multiple sectors are spread across the hillside at slightly different aspects and elevations, so conditions may vary — sheltered or north-facing boulders will be wetter than the most exposed faces.
- The cumulative 41mm over 28 days with only short dry windows between showers means the sandstone has had little opportunity to fully dry internally, even if the surface appears dry today.
Warnings
2
- Rain is forecast from June 15 onwards, so this narrow drying window will close — do not assume conditions will improve over the coming week.
- The surface may appear dry while internal moisture remains significant after 41mm in 28 days; test holds carefully and be prepared to walk away.
Reasoning
The last significant rain was 5.7mm on June 11, preceded by frequent showers totalling 41mm over 28 days, meaning the rock has been repeatedly re-saturated with limited drying windows between events.
Two and a half dry days with strong westerly winds (24–32 km/h) and moderate temperatures (15–18°C) on an exposed hilltop have likely dried the surface well, but the west aspect limits direct sun hours and 68–75% humidity slows evaporation somewhat.
Repeated wetting cycles through late May and early June will have kept internal moisture levels elevated; while surface holds may feel dry, deeper pore saturation could still compromise hold integrity, particularly on well-trafficked problems.
Early summer conditions are improving with longer days and warmer temperatures, but the recent unsettled spell has kept average temperatures modest (~11.5°C over 7 days) and humidity high, limiting the seasonal drying advantage.
Contributing Factors
6
41mm over 28 days with repeated re-wetting events has kept the porous Fell Sandstone loaded with moisture, limiting full internal drying.
Approximately 2.5 consecutive dry days (June 12–14) have allowed surface drying to begin, aided by zero precipitation today.
Strong winds of 24–32 km/h from the west on June 12–13 across this exposed hilltop will have significantly accelerated surface evaporation.
Average humidity of 74% over the last week and 75% today slows evaporation rates, particularly for deeper moisture within the rock.
The west-facing orientation only receives direct sunlight from mid-afternoon onward, reducing the total solar drying input compared to a south-facing crag.
Light rain forecast tomorrow (1.1mm) and heavier rain on June 16 (8.6mm) will re-wet any progress made, closing the current drying window.
Recommendations
3
- Visit today if possible — the current dry window is closing with rain forecast from tomorrow; check the base of the crag for damp ground as a reliable indicator of internal moisture.
- Focus on the most exposed, wind-scoured boulders and avoid any problems near ground level, in sheltered alcoves, or with visible moss or seepage.
- If any holds feel cool to the touch relative to the air temperature, or if chalk absorbs unusually quickly, back off — the rock is still damp internally.
Do Not Climb
45%
4 days ago
Despite two dry days since the last rain on June 11 (5.7mm), the preceding two weeks have seen repeated rainfall totalling 41mm across 28 days, with high humidity averaging 74%. The rock has had insufficient drying time given the cumulative moisture loading, and internal dampness is likely despite surface drying.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Hepburn's exposed hilltop position and strong westerly winds today (31 km/h) will be accelerating surface evaporation, but internal moisture from the prolonged wet spell likely persists in the porous Fell Sandstone.
- The west-facing aspect receives only afternoon and evening sun, limiting solar drying compared to a south-facing crag — morning approaches will find shaded, cooler rock.
- Multiple sectors are spread across the hillside at varying angles and exposures; some sheltered lower sections and mossy areas will retain moisture significantly longer than the most exposed faces.
- The recent wet pattern (12.2mm in the last 7 days alone across multiple events) means the rock has never fully dried out between showers, creating a cumulative saturation effect that two dry days cannot resolve.
Warnings
2
- The rock surface may appear dry while the interior remains dangerously weakened — do not rely on visual or touch assessment of the surface alone.
- Repeated wet-dry cycling over recent weeks increases the risk of unexpected hold failure even on well-known problems.
Reasoning
Cumulative rainfall of 12.2mm over the last 7 days across multiple events (June 8–11), with only 2 consecutive dry days since, means the rock is very likely still holding significant internal moisture despite possible surface drying.
Strong winds (24–31 km/h) and moderate temperatures (15–18°C) over the two dry days will have dried the surface effectively, but the west aspect limits solar input to afternoons, and humidity has remained around 69–75%, slowing deep drying of the porous sandstone.
With repeated wetting events over the past two weeks and insufficient cumulative drying, internal pore saturation is likely still elevated, posing a real risk of hold breakage and grain loosening on the iron-oxide-cemented Fell Sandstone.
Early June temperatures are moderate but the persistent unsettled weather pattern with frequent showers has prevented the sustained dry spells needed to fully dry out sandstone after winter and spring moisture loading.
Contributing Factors
6
Multiple rain events from June 1–11 totalling over 12mm in the last week alone have kept the rock in a near-continuously damp state with no opportunity to fully dry.
Two consecutive dry days is insufficient drying time for Fell Sandstone after repeated wetting, especially with the 5.7mm event on June 11.
The exposed hilltop position with winds of 24–31 km/h over the dry period significantly aids surface evaporation and is the most favourable drying factor present.
The west-facing orientation means the crag receives direct sunlight only in the afternoon and evening, reducing total solar drying hours compared to a south-facing venue.
Humidity in the 69–75% range over the drying period is not low enough to drive rapid deep evaporation from porous sandstone.
41mm of rain over the past 28 days with few extended dry windows means background moisture levels in the rock are elevated.
Recommendations
3
- Wait for at least one more full dry day with continued wind before climbing; a visit on June 15 would be the earliest reasonable window if conditions stay dry.
- If you do visit, perform the ground-moisture test at the crag base — if soil or sand beneath the rock is damp, the rock interior is almost certainly still wet.
- Focus on the most exposed and overhanging faces if conditions seem promising on arrival, and avoid any lower or sheltered sections where moisture will linger longest.
Do Not Climb
35%
5 days ago
Despite one dry day today, 5.7mm fell yesterday (June 11) and 12.9mm has fallen in the last 7 days across multiple events, with high average humidity (77%). The rock has had insufficient drying time — only ~24 hours since the last significant rainfall — and internal moisture is very likely still present in the porous Fell Sandstone.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Hepburn's west-facing aspect means it receives afternoon and evening sun but misses the morning drying window, slowing evaporation after overnight moisture accumulation.
- The exposed hilltop position is a significant asset here — today's 22 km/h westerly wind blows directly onto the face, which is the most effective drying configuration for this crag.
- Multiple sectors are spread across the hillside at varying angles and elevations, meaning some sheltered lower boulders will retain moisture much longer than exposed upper faces.
- The recent pattern of repeated light-to-moderate rainfall events (June 1–11) means the rock has been repeatedly re-wetted before fully drying, keeping internal saturation elevated over the past 10+ days.
Warnings
2
- The rock surface may appear dry while internal saturation remains dangerously high — Fell Sandstone loses up to 50% of its compressive strength when wet, and significant weakening begins at just 1% saturation.
- The repeated wetting cycle over the past 10 days means internal moisture levels are likely much higher than a single rainfall event would produce — treat this as a prolonged wet period requiring extended drying.
Reasoning
With 5.7mm falling on June 11 and cumulative wetting of 12.9mm over the past week across at least six separate rain events, the Fell Sandstone is very likely still holding significant internal moisture despite the surface potentially appearing dry.
Only one full dry day (today, June 12) has elapsed since the last rain, with moderate temperatures (~16.8°C) and a helpful 22 km/h westerly wind directly onto the west-facing aspect, but this is far short of the 48–72+ hours needed after this volume and pattern of rainfall.
The repeated wetting cycle over the past 10 days will have kept internal saturation well above the threshold where significant strength loss occurs, making hold breakage a real risk even if the surface feels dry.
Early June conditions with moderate temperatures and reasonable day length are generally favourable for drying, but the persistently high humidity (77% average over the past week) has been limiting evaporative drying potential.
Contributing Factors
6
Six separate rainfall events totalling 12.9mm in the past 7 days have kept the rock in a near-continuously wet state, preventing any meaningful internal drying.
Only one dry day since the last 5.7mm rainfall on June 11; the minimum guideline for this volume on porous sandstone is 48–72 hours of dry weather.
Average humidity of 77% over the past week, with yesterday at 86%, significantly reduces evaporative drying rates from the rock surface.
Today's 22 km/h westerly wind blows directly onto the west-facing crag, which is the best-case drying scenario for this aspect and provides meaningful evaporative assistance.
Temperatures around 15–17°C with no frost risk are adequate for drying, though not exceptional.
41mm over the past 28 days across many events means the rock has had little opportunity to fully dry out at depth, and background saturation levels are elevated.
Recommendations
3
- Wait at least until June 14 (two full dry days after June 12) before considering a visit, and ideally longer given the cumulative wetting pattern.
- If visiting on June 14, perform a thorough touch test on multiple faces and check that the ground at the crag base is completely sandy-dry before climbing.
- Consider the more exposed upper boulders first as they will dry fastest; avoid lower sheltered problems and any areas with visible moss or seepage.
Do Not Climb
90%
6 days ago
Hepburn Crags has received persistent rainfall over the past 10 days (~40mm cumulative since June 1st), with 5.1mm falling today including heavy showers through the afternoon. The rock will be thoroughly saturated internally and needs a sustained dry spell before climbing is appropriate.
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 mid-afternoon eliminate any solar drying benefit.
- The exposed hilltop position and forecast strong westerly winds (24–38 km/h) from tomorrow will significantly aid drying once rain stops, but the cumulative moisture load from recent weeks requires more than a day or two.
- Multiple sectors are spread across the hillside at varying angles and aspects, so some sheltered lower sections may retain moisture longer than the most exposed upper faces.
- Fell Sandstone's high porosity (up to 20.7%) means the repeated wetting events since June 1st will have driven moisture deep into the rock — surface dryness will be misleading for several days.
Warnings
2
- Fell Sandstone loses up to 50% of its strength when wet — climbing on saturated rock risks permanent hold breakage and irreversible route damage.
- The rock surface may appear dry well before the interior has dried; do not trust surface appearance alone after this prolonged wet period.
Reasoning
The rock is almost certainly saturated internally given ~40mm of rain over the past 10 days with only brief dry intervals insufficient for meaningful drying, plus 5.1mm falling today.
Although the exposed position and strong forecast winds (24–38 km/h westerly, directly onto the face) will accelerate drying from tomorrow, the cumulative moisture from repeated wetting since June 1st means at least 48–72 hours of dry weather is needed before even surface conditions can be trusted.
With the rock likely near or above 60% pore saturation from prolonged wetting, hold breakage risk is significant — Fell Sandstone loses up to 50% compressive strength when wet, and the iron oxide holds are particularly vulnerable.
Early summer temperatures (14–17°C) and moderate humidity (65–75%) in the forecast are helpful for drying but cannot compensate for the sustained wet period that has kept the rock saturated for over a week.
Contributing Factors
6
5.1mm of rain falling through the afternoon today means the rock surface is currently wet and being actively re-saturated.
Approximately 40mm has fallen in the past 28 days with ~27mm since June 1st alone, keeping the rock persistently wet with no sustained drying window.
Average humidity of 76% over the past week with peaks to 87–95% today severely limits evaporative drying between rain events.
The hilltop setting and forecast strong westerly winds (24–38 km/h) directly onto the west-facing crag will significantly accelerate drying once rain ceases.
The 6-day forecast shows 0.0mm precipitation with falling humidity (66–71%), which will progressively dry the rock if it holds.
Repeated wetting over the past 10+ days will have driven moisture deep into the porous Fell Sandstone, meaning surface drying will significantly precede internal drying.
Recommendations
3
- Do not climb today — the rock is actively wet from ongoing rain and deeply saturated from the past week's rainfall.
- Wait for at least 48–72 hours of continuous dry weather with wind before considering a visit; the earliest reasonable assessment window is Saturday June 14th.
- On arrival, check the ground at the base of the crag — if soil or sand is still damp, the rock interior is almost certainly still wet and climbing should be avoided.
Do Not Climb
90%
8 days ago
Hepburn Crags has received significant rainfall over the past 10 days (~27mm from June 1–4 alone, plus lighter showers on June 6 and 8), and today has added another ~11mm with heavy showers continuing through the afternoon and evening. The rock will be thoroughly saturated and conditions are clearly unsuitable for climbing today or in the immediate future.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The west-facing aspect means Hepburn only receives afternoon and evening sun, which limits direct solar drying compared to south-facing venues — particularly problematic after prolonged wet spells like the current one.
- The exposed hilltop position is the crag's saving grace for drying, as the consistent wind (often 18–30+ km/h) significantly accelerates surface evaporation once rain stops.
- Multiple sectors spread across the hillside mean conditions can vary — upper, more exposed blocks may dry before lower sheltered ones near the tree line, so climbers should check individual boulders carefully.
- The prolonged wet period from late May through early June (41mm over 28 days) means the sandstone has had repeated wetting cycles with insufficient drying between them, likely keeping internal moisture levels elevated.
Warnings
2
- The Fell Sandstone is almost certainly deeply saturated after repeated wetting cycles — surface dryness does NOT mean the rock is safe to climb.
- Climbing on saturated sandstone causes permanent, irreversible damage to holds through grain loosening and breakage.
Reasoning
The rock is currently saturated from today's 10.9mm of rain on top of a very wet preceding week (25mm in the last 7 days), with no meaningful dry spell since late May to allow internal drying.
The west aspect and exposed hilltop wind will help once rain stops, but with further rain forecast on June 10 (1.3mm) and June 11 (2.7mm), meaningful drying cannot begin until June 12 at the earliest.
Repeated wetting over the past 10+ days means the Fell Sandstone is likely near maximum saturation, placing holds at serious risk of breakage — 80% of strength loss occurs within hours of wetting and the rock has had no chance to recover.
Early June temperatures (8–19°C) and moderate humidity (70–86%) provide reasonable but not exceptional drying potential; the persistent unsettled weather pattern is unusual for the season and has kept the rock in poor condition.
Contributing Factors
6
10.9mm of rain today with the bulk falling as heavy showers in the afternoon, thoroughly wetting already-damp rock.
Approximately 27mm fell between June 1–4 with additional showers on June 6, 8, and 9, giving the sandstone no opportunity to dry internally.
Rain is forecast on both June 10 (1.3mm) and June 11 (2.7mm), delaying the start of any meaningful drying period until June 12.
Average humidity over the past 7 days is 78%, significantly slowing evaporation from the porous sandstone.
Consistent winds of 18–33 km/h at this exposed site will significantly aid surface drying once the rain stops.
A sustained dry window is forecast from June 12 onwards with improving temperatures (up to 22°C) and strong winds, which should begin meaningful drying.
Recommendations
3
- Do not climb today or in the next two days — the rock is saturated and any climbing risks permanent hold damage on this irreplaceable Fell Sandstone.
- The earliest realistic window to assess conditions is June 13 or 14, after at least 48 hours of dry weather with good wind; use the field test of checking if the ground at the crag base is bone-dry.
- If visiting on June 13–14, prioritise the most exposed upper blocks and overhanging faces which will dry fastest, and avoid any lower or sheltered sectors.
Do Not Climb
90%
9 days ago
Hepburn Crags has received over 26mm of rain in the last 7 days across multiple events, with the most recent rain falling today (4.1mm, mostly early morning). The rock will be thoroughly saturated internally and needs a sustained dry spell of at least 48–72 hours before it is safe to climb on.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Hepburn's exposed hilltop position and west-facing aspect mean it benefits from prevailing SW/W winds, which is a significant drying advantage once rain stops — but the repeated wetting over the past 10 days has kept the sandstone saturated.
- Multiple sectors are spread across the hillside at slightly different aspects and elevations, so some sheltered lower boulders may hold moisture longer than the main exposed faces.
- The long dry spell from May 11–29 would have left the rock in excellent baseline condition, but the subsequent 10-day wet period (32mm cumulative from May 30 to today) has reversed that entirely.
- Ground conditions at the base of the boulders are a reliable proxy for internal moisture — if the turf and soil are damp, the rock is almost certainly still wet inside.
Warnings
2
- Climbing on saturated Fell Sandstone causes permanent, irreversible damage to holds — iron oxide features can snap off when the rock is weakened by moisture.
- The rock surface may appear dry this afternoon while remaining dangerously saturated internally — do not be deceived by surface appearance.
Reasoning
The rock has absorbed approximately 32mm of rain over the past 10 days across at least 7 separate rainfall events, with 4.1mm falling today — internal saturation is very likely near maximum despite the exposed position.
Although the afternoon today looks dry with moderate wind (~15–19 km/h) and dropping humidity (down to 44%), this provides only a few hours of surface drying after this morning's rain, which is wholly insufficient for Fell Sandstone that has been repeatedly wetted.
With repeated wetting over the past 10 days pushing internal moisture levels high, compressive strength will be significantly reduced (potentially 30%+ loss), and iron oxide holds are at serious risk of breakage.
Early June temperatures (8–19°C) and moderate winds are reasonable for drying, but the persistently high humidity (79% average over the past week) is slowing evaporation considerably.
Contributing Factors
6
Over 26mm in the last 7 days across multiple events means the rock has had no opportunity to dry internally between wettings.
4.1mm fell mostly in the early morning hours, re-wetting any surface drying that may have occurred.
Average humidity of 79% over the past week severely limits evaporation rates from the rock surface.
The exposed site catches wind effectively, which will accelerate drying once a sustained dry spell begins.
SW winds of 15–20 km/h and humidity dropping to ~45% this afternoon will begin surface drying, but hours of drying are insufficient after sustained wetting.
Further rain is forecast on June 9 (3.1mm), June 10 (4.9mm), June 11 (0.2mm), and June 12 (2.1mm), preventing any meaningful drying window.
Recommendations
3
- Do not climb today — the rock is saturated from repeated rainfall over the past 10 days and rain this morning.
- Monitor the forecast for a sustained dry window of at least 48–72 hours; the earliest realistic opportunity may be June 14 or later if the forecast holds.
- When you do visit, check the ground at the base of the boulders — if it is damp rather than sandy-dry, the rock is still too wet internally.
Do Not Climb
35%
10 days ago
Hepburn Crags has received significant rainfall over recent days (27mm in the last 7 days, including 5.6mm just three days ago and 0.7mm yesterday), with only one full dry day since. Despite the exposed position and moderate wind, the high humidity (averaging 82% over the last week) and cool temperatures are severely limiting drying, and the forecast shows further rain arriving tomorrow through to at least June 12th.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The recent rain sequence (June 1–4 totalling ~26mm, plus 0.7mm on June 6) represents a sustained wetting event that will have deeply penetrated the porous Fell Sandstone, requiring extended drying well beyond the single dry day achieved so far.
- The west-facing aspect means the crag only receives afternoon and evening sun, which is less effective for drying than south-facing venues, particularly given the cool temperatures and high humidity this week.
- The exposed hilltop position and moderate-to-strong southerly winds (27.7 km/h today) are the most favourable drying factor, but are insufficient to overcome the combination of recent heavy rain and persistent high humidity.
- Multiple sectors spread across the hillside may dry at different rates — upper exposed sections could be closer to surface-dry while lower sheltered areas near the forestry will hold moisture much longer.
Warnings
2
- Fell Sandstone loses up to 50% of its compressive strength when wet — climbing on inadequately dried rock risks permanent hold breakage and irreversible route damage.
- The rock surface may appear dry in the wind while the interior remains saturated; do not rely on visual or touch assessment alone after this volume of recent rain.
Reasoning
With 26mm of rain falling between June 1–4 and a further 0.7mm on June 6, the rock will be substantially saturated internally despite only one full dry day having passed — far short of the 48–72+ hours of dry weather required after heavy rain.
The exposed position and today's 27.7 km/h southerly wind help surface drying, but persistently high humidity (79–87% over recent days) drastically reduces net evaporation, meaning internal moisture will be retained well beyond what the single dry day can address.
At likely saturation levels well above 1%, compressive strength will be significantly reduced (potentially 10–50%), and the iron oxide holds characteristic of Fell Sandstone are at serious risk of breakage — climbing now risks permanent route damage.
Early June should offer reasonable drying conditions, but this week's cool, humid, and unsettled pattern is performing well below seasonal norms, and the incoming forecast rain through June 8–12 will prevent any meaningful drying window from developing.
Contributing Factors
6
Approximately 27mm fell in the last 7 days including a sustained multi-day wetting event (June 1–4), deeply saturating the porous sandstone.
Only one full dry day has elapsed since the last rain (0.7mm on June 6), far short of the 48–72+ hours needed after heavy rain on Fell Sandstone.
Humidity has averaged 82% over the last week, severely limiting evaporative drying even with wind exposure.
The hilltop setting and 27.7 km/h southerly wind today provide the best available drying factor, accelerating surface moisture removal.
Average temperatures around 12.9°C over the past week are below optimal for rapid evaporative drying of saturated sandstone.
A further 19mm of rain is forecast across June 8–12, preventing any meaningful drying window from developing in the coming days.
Recommendations
3
- Do not climb today — the rock is almost certainly still saturated internally despite any surface drying from today's wind.
- Monitor conditions after June 12th; a sustained dry spell of at least 48–72 hours with lower humidity would be needed before reassessing.
- If visiting the area, consider non-porous alternatives such as Bowden Doors whinstone or Kyloe Crag whinstone sections which are less susceptible to moisture damage.
Do Not Climb
92%
11 days ago
Hepburn Crags has received over 28mm of rain in the past week across multiple days (June 1–4 plus today), with high humidity averaging 81%. Despite the exposed hilltop position, there has been insufficient drying time and the rock will be holding significant internal moisture, making climbing unsafe on this porous Fell Sandstone.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The west-facing aspect receives only afternoon/evening sun, limiting solar drying compared to south-facing venues, though the exposed hilltop position helps with wind-driven evaporation.
- Multiple sectors are spread across the hillside at varying angles and orientations, so some sheltered boulders in the lee of the hill or near tree cover will retain moisture far longer than the most exposed faces.
- The recent multi-day rain sequence (4.9mm, 9.4mm, 6.4mm, 5.6mm over June 1–4) will have driven moisture deep into the sandstone, meaning even surface-dry rock is likely saturated internally.
- The Forestry Commission car park approach passes through wooded terrain; boulders near tree cover or on the lower slopes will dry significantly slower than those on the open hilltop.
Warnings
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- Climbing on saturated Fell Sandstone causes irreversible hold breakage — the iron oxide features that create Hepburn's small holds are especially fragile when wet.
- The rock surface may appear dry while remaining deeply saturated internally; do not rely on visual inspection alone after this level of cumulative rainfall.
- Further heavy rain is forecast through June 11, so conditions will worsen before they improve.
Reasoning
With 28mm of rain over the past 7 days culminating in 1.2mm today, and average humidity at 81%, the rock is almost certainly saturated internally despite any surface drying on June 5.
The single dry day on June 5 with moderate wind (19 km/h SW) and lower humidity (65%) would have begun surface drying, but today's 1.2mm of rain and 87% humidity have reset progress — far short of the 48–72+ hours needed after heavy cumulative rainfall.
With deep moisture penetration from repeated soaking events, compressive strength is likely reduced by 30%+ and iron oxide holds are at serious risk of breakage, threatening permanent route damage.
Early June temperatures (8–15°C) are moderate but not warm enough to drive rapid evaporation, and the prolonged wet spell means the rock has had little chance to dry between rain events.
Contributing Factors
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Over 28mm fell across June 1–4 in multiple events, driving moisture deep into the porous sandstone with no adequate drying window between showers.
Today's 1.2mm of rain at 87% humidity has re-wetted the surface, resetting any partial drying achieved on the single dry day (June 5).
Average humidity of 81% over the past week severely limits evaporative drying, keeping moisture locked in the rock.
The exposed position and forecast winds of 25–35 km/h will help accelerate surface drying once rain stops, but cannot compensate for the volume of absorbed water.
Temperatures around 12–17°C provide some evaporative energy but are not warm enough to drive rapid drying of deeply saturated sandstone.
Further rain is forecast on June 8 (7.3mm), June 9 (5.4mm), June 10 (5.4mm), and June 11 (11.4mm), meaning no sustained drying window is available in the coming days.
Recommendations
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- Do not climb at Hepburn Crags until a sustained dry spell of at least 3–4 days follows the current and forecast rain sequence.
- Consider non-porous alternatives such as the Whin Sill venues (e.g. Bowden Doors whinstone, Crag Lough) where structural damage from moisture is not a concern, though surfaces may still be slippery.
- If visiting the area, use the time to scout sectors and plan for a return visit once conditions improve — the forecast suggests no suitable window before at least June 13 at the earliest.
Climbing Outlook