Condition Analysis
AI-powered assessment using site data and 14-day weather history
Crag Lough has been subjected to a prolonged wet spell with over 80mm in the last 28 days and light rain again today; although dolerite doesn't absorb water, the north-facing aspect, near-saturated humidity (92%), and persistent cloud cover mean surfaces are likely still damp and slippery. A brief drier window this afternoon may allow some surface drying, but conditions remain marginal and the forecast shows continued unsettled weather.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north-facing aspect receives virtually no direct sun at any time of year, so drying relies almost entirely on wind — and today's light winds (5–15 km/h) are insufficient to clear residual moisture quickly.
- Peregrine falcons nest at Crag Lough in spring and early summer; check current BMC RAD restrictions before approaching any buttress, as seasonal closures may still be in effect in mid-June.
- The Whin Sill ridge is a UNESCO World Heritage Site (Hadrian's Wall); loose blocks at the crag base are common after the prolonged wet period and active freeze-thaw cycles earlier in the season.
- Seepage from the saturated moorland and grazing land above can persist for days after heavy rain, creating persistent weep lines on the upper sections of the buttresses even when the main face appears dry.
Warnings
2
- Dolerite is extremely slippery when wet — a thin moisture film that is difficult to see can cause sudden friction loss on an otherwise dry-looking hold.
- Loose blocks at the crag base are a serious hazard after the prolonged wet period; wear a helmet on approach and beneath routes.
Reasoning
Today saw light rain (1.2mm total, mostly early morning), following a very wet fortnight with 17.3mm in the last 7 days and 81.4mm over 28 days; humidity is at 92% and the rock surface is almost certainly damp.
The north-facing aspect gets no direct sun, and today's winds are light (5–15 km/h) with 100% cloud cover, so surface drying will be slow despite dolerite's non-porous nature — a few hours of moderate wind this afternoon may partially dry exposed faces but not reliably.
Dolerite does not weaken when wet, but loose blocks at the crag base are a perennial hazard and the prolonged wet spell may have loosened additional material through water ingress into existing cracks.
Mid-June should offer reasonable conditions, but this year's persistent westerly rain pattern has kept the crag unusually wet; check for active peregrine nesting restrictions before visiting.
Contributing Factors
7
Over 80mm in 28 days with 17mm in the last week alone means the surrounding ground is saturated, feeding seepage lines onto the crag.
Humidity at 92% with 100% cloud cover prevents effective evaporative drying of surface moisture.
Around 1mm of rain fell between 02:00 and 08:00 today, leaving surfaces freshly wet.
Whin Sill dolerite does not absorb water, so only surface moisture needs to clear — no structural risk from climbing on damp rock.
The high exposed position catches wind which aids surface drying, though today's winds are lighter than recent days.
No direct sunlight reaches the crag face, eliminating solar drying and leaving wind as the only drying mechanism.
Further rain is forecast on each of the next five days (1.4–8.2mm daily), with no sustained dry spell in sight.
Recommendations
3
- Wait for a sustained dry spell with stronger winds before visiting — the current prolonged wet pattern makes reliable dry conditions unlikely this week.
- If you do visit this afternoon (the driest window today, ~12:00–20:00), test friction carefully on lower holds before committing to anything committing; retreat immediately if the rock feels greasy.
- Check the BMC RAD for current peregrine nesting restrictions at Crag Lough before planning your visit, as closures may still apply in mid-June.
Previous Analyses
Marginal — Assess Conditions
55%
2 days ago
The rock has been through a very wet fortnight with nearly 80mm of rain in 28 days, but today offers a dry window from mid-morning through early evening before light rain returns tonight. Dolerite doesn't absorb water, and moderate winds should clear surface moisture relatively quickly, but the north-facing aspect, high humidity, and recent persistent dampness mean residual seepage and condensation are likely — check the rock carefully on arrival.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north-facing aspect receives virtually no direct sun even in mid-June, so surface drying relies almost entirely on wind; seepage from the grassy cliff-top can persist for days after prolonged wet spells like the last two weeks.
- Crag Lough sits on the exposed Whin Sill ridge at 260m where wind is reliable, but overnight temperatures dropped to 4°C with humidity near 98%, meaning heavy dew or condensation will coat the rock until mid-morning at earliest.
- Peregrine falcons nest here in spring — check current BMC RAD restrictions before approaching buttresses, as seasonal closures may still be in effect in early June.
- The dense black dolerite is notoriously slippery when even slightly damp; a thin film of moisture that wouldn't concern you on gritstone can make whinstone lethal, so apply the finger-touch test to multiple holds before committing.
Warnings
3
- Rain returns tonight from 21:00 and heavier rain is forecast for the next several days — this afternoon may be the only viable window this week.
- Dense black dolerite becomes extremely slippery with even a thin moisture film; if holds feel glassy or slick, back off immediately.
- Loose blocks at the crag base may have been destabilised by the recent prolonged wet spell — wear a helmet and be alert below the cliff.
Reasoning
Heavy rain on June 1–4 (nearly 50mm in four days) followed by continued showers through June 13, plus 0.9mm today, means the surrounding ground is saturated and seepage from above is very likely despite the non-porous rock surface.
Today's dry window from roughly 08:00–20:00 with winds of 12–19 km/h from the east should clear direct surface water within a couple of hours, but the north-facing aspect gets no solar assistance and humidity remains 63–75% through the afternoon — marginal for full drying.
Dolerite does not weaken when wet, but the active freeze-thaw zone at the crag base produces loose blocks year-round; with recent heavy rain, debris and loose material at the base may have shifted.
Early June at 260m in Northumberland means long daylight hours but cool temperatures (averaging only 10°C this past week), which slows evaporation; the prolonged wet spell is typical of an unsettled early summer pattern.
Contributing Factors
7
Nearly 50mm fell June 1–4 with continued showers totalling 78mm over 28 days, saturating the ground above the crag and feeding seepage lines.
Whin Sill dolerite does not absorb water, so surface moisture clears within hours once rain stops and wind picks up.
No precipitation is forecast between 08:00 and 20:00 today, with winds of 12–19 km/h to assist surface drying.
The crag receives negligible direct sunlight even in mid-June, removing the most effective drying mechanism and allowing condensation to linger.
Humidity has averaged 85% over the past week and remains 63–75% during today's best window, slowing evaporation and risking condensation films on the cold rock.
Temperatures dropped to 4°C overnight with 97–98% humidity, virtually guaranteeing heavy dew that will take hours to clear from the shaded north face.
The Whin Sill ridge is highly exposed and today's 12–19 km/h winds will strip surface water relatively quickly once the morning warms.
Recommendations
3
- Target the early-to-mid afternoon (12:00–17:00) for the driest window, allowing morning condensation to clear; touch-test multiple holds across the face before committing.
- Check the BMC RAD for current peregrine nesting restrictions — seasonal closures at Crag Lough may still be in effect in early June.
- Avoid lower-grade slab routes where friction is critical; vertical or slightly overhanging lines on prominent buttresses will drain fastest and offer the best grip.
Marginal — Assess Conditions
55%
3 days ago
Today is the first dry day after a prolonged wet spell that delivered nearly 24mm in the last week alone. The exposed, windy position and non-porous dolerite mean surface water should clear quickly, but the north-facing aspect, high humidity (79%), and cool temperatures mean seepage and residual dampness in cracks and ledges are likely. Climbers should visually inspect the rock before committing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north-facing aspect receives virtually no direct sun, so seepage from the grassy Hadrian's Wall ridge above can persist for days after prolonged rain, even though the rock itself doesn't absorb water.
- Crag Lough sits above a lough (lake) whose evaporation contributes to local humidity, keeping the dense black dolerite surfaces damp longer than exposed wind alone would suggest.
- Peregrine falcons nest here in spring — check the BMC RAD for any seasonal restrictions that may still be in effect into early June.
- Loose blocks and freeze-thaw debris accumulate at the crag base; after weeks of wet weather the turf and soil at the top can be saturated, making abseil anchors and top-out moves treacherous.
Warnings
2
- Dense black dolerite becomes extremely slippery when even slightly damp — a thin moisture film may be invisible until you're committed.
- Loose blocks at the crag base may have been destabilised by the prolonged wet spell; take extra care on approach and at belays.
Reasoning
After 23.9mm in the past 7 days — including 8.7mm on June 11 and 2.2mm on June 12 — the non-porous dolerite surface itself will shed water quickly, but seepage from saturated ground above and residual moisture in cracks and ledges is very likely given only one dry day so far.
Today's moderate NW wind (16.6 km/h) on this exposed ridge will help dry surfaces, but the north-facing aspect means no direct solar heating, and humidity remains at 79%, limiting evaporative drying of seepage zones.
Dolerite does not weaken when wet, but loose blocks at the crag base may have been destabilised by the prolonged wet period and any residual freeze-thaw activity at 260m altitude.
Early June should offer reasonable drying potential, but this spell has been unusually cool (average 10.5°C over the past week) with persistent high humidity, making conditions more reminiscent of late autumn than early summer.
Contributing Factors
6
Nearly 24mm fell in the past 7 days across multiple events, with significant rain on June 1–4 (49.5mm) and further showers through June 11–13, saturating the ground above the crag.
Whin Sill dolerite does not absorb moisture and can shed surface water within hours of rain stopping, unlike sandstone which requires days.
The north-facing orientation receives negligible direct sunlight, significantly slowing evaporation of seepage and surface moisture films.
The high exposed position on the Whin Sill escarpment ensures good airflow (16.6 km/h today), which is the primary drying mechanism given the lack of sun.
Humidity at 79% today and averaging 84% over the past week limits evaporative drying and can leave a thin moisture film on the dense black rock.
With just one dry day after weeks of frequent rain, seepage from the saturated ground above is very likely still active on the crag face.
Recommendations
3
- Visit today only if prepared to walk away — inspect surfaces carefully for moisture films and seepage before climbing, particularly on lower-angled slabs where friction is critical.
- Focus on steeper, more featured routes where positive holds compensate for any residual dampness, and avoid friction-dependent slab climbs entirely.
- Check the BMC RAD for any active peregrine nesting restrictions before travelling, and be aware that the saturated ground at the cliff top makes top-outs and anchors less reliable than usual.
Do Not Climb
45%
4 days ago
Crag Lough has received nearly 26mm of rain over the past 7 days with rain again today (2.6mm), and the north-facing aspect at 260m with high humidity (85% average) means seepage and surface moisture will persist despite strong winds. Although dolerite is non-porous and dries quickly in theory, the prolonged wet spell, north-facing aspect, and continuing dampness make friction unreliable today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north-facing aspect receives virtually no direct sun, so surface moisture from the recent prolonged wet spell will linger on ledges, cracks, and vegetated sections far longer than on south-facing dolerite.
- Seepage from the saturated moorland and grazing land above the crag will produce weeping lines down the buttresses for days after this extended wet period, even though the rock itself doesn't absorb water.
- Active peregrine nesting restrictions may apply in spring and early summer — check the BMC RAD for current seasonal closures before visiting.
- The exposed ridge position means strong westerly winds (40 km/h today) will strip surface water from exposed faces quickly, but sheltered gullies and east-facing recesses between buttresses will remain damp.
Warnings
3
- Dolerite is extremely slippery when wet — even a thin moisture film drastically reduces friction; do not underestimate the slip hazard.
- Loose blocks at the crag base are a persistent hazard, potentially worsened by the recent prolonged wet and cool spell.
- Very strong winds today (40 km/h) pose a direct safety risk on exposed ridge-top positions — beware of being blown off balance.
Reasoning
With 2.6mm of rain today on top of nearly 26mm in the past week and persistently high humidity (80–93%), surface moisture, seepage, and damp vegetation will be widespread across the crag.
Strong winds (40 km/h today) will help strip surface water from exposed faces within hours once rain stops, but the north-facing aspect and lack of direct sun mean sheltered areas and seepage lines will take considerably longer to dry.
Dolerite does not weaken when wet, but loose blocks at the crag base are a perennial hazard, and the recent prolonged wet and cool conditions may have promoted minor freeze-thaw loosening at altitude.
Early June conditions have been unusually cool (averaging just 10.6°C over the past week) with persistent Atlantic fronts delivering repeated rainfall, limiting drying windows despite the long daylight hours.
Contributing Factors
8
Nearly 26mm in the past 7 days across multiple rain events with no consecutive dry days means the crag environment is thoroughly saturated.
A further 2.6mm today means surfaces are actively wet right now with no drying window yet established.
The north-facing orientation receives no meaningful direct sun, significantly slowing the evaporation of surface moisture and seepage.
Strong westerly winds at 40 km/h today and forecast moderate winds tomorrow will efficiently strip surface water from exposed faces once rain ceases.
Whin Sill dolerite does not absorb water, so the rock itself will dry rapidly once surface moisture evaporates — no structural risk from climbing soon after rain.
Average humidity of 85% over the past week and 80% today slows evaporation and keeps surfaces tacky with moisture film.
The saturated moorland and grazing land above the crag will feed seepage lines down the buttresses for days after this extended wet period.
Averaging just 10.6°C over the past week limits evaporative drying, particularly on the shaded north face.
Recommendations
3
- Wait for at least one full dry day with wind before committing — tomorrow (June 14) looks promising if rain clears tonight as forecast.
- Inspect seepage lines between buttresses on arrival; exposed wind-blasted faces will dry first, while sheltered gullies may remain slick.
- Check the BMC RAD for peregrine nesting restrictions at Crag Lough before visiting, as closures may be in effect during early June.
Do Not Climb
40%
5 days ago
Crag Lough has received substantial rain over the past two weeks (77mm in 28 days, 25mm in the last 7 days alone), with rain again today and more forecast tomorrow. Although dolerite is non-porous and dries quickly, the persistent wet pattern, north-facing aspect, high humidity (86% average), and cool temperatures mean the rock is very likely still damp and slippery — we recommend waiting for a proper dry spell.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north-facing aspect at 260m receives virtually no direct sun, so surface moisture from rain and seepage lingers far longer than on south-facing dolerite.
- Heavy rainfall from June 1–4 (nearly 50mm in four days) will have saturated the ground above the crag, feeding seepage lines down the cliff face that persist for days even after rain stops.
- Loose blocks at the crag base are a heightened risk after this prolonged wet period — saturated ground and repeated wetting/drying cycles can destabilise already-loose material.
- Peregrine nesting restrictions may still be in effect in early June — check the BMC RAD for current seasonal bird closures before visiting.
Warnings
3
- Dolerite becomes extremely slippery when damp — even a thin moisture film invisible to the eye can cause sudden friction loss on this dense black rock.
- Loose blocks at the crag base pose increased risk after this extended wet period; approach with caution and wear a helmet.
- Strong winds forecast for tomorrow (41 km/h) may make exposed climbing on the ridge unsafe regardless of rock conditions.
Reasoning
With 2.9mm of rain today, 8.7mm yesterday, and 25mm in the last seven days at 86% average humidity, surface moisture on the rock is almost certain despite dolerite's non-porous nature.
Strong westerly winds (25–35 km/h) help strip surface water, but the north-facing aspect and cool temperatures (10.5°C average) severely limit evaporative drying, and there has been no consecutive dry day in the recent record.
Dolerite does not weaken structurally when wet, but the prolonged wet period increases the risk of loose blocks shifting at the crag base due to saturated ground and active freeze-thaw legacy from winter.
Early June should offer improving conditions, but this has been an unusually wet and cool spell for the season; temperatures are running well below average, reducing drying capacity.
Contributing Factors
7
Over 77mm in 28 days with 25mm in the last week alone means the crag and surrounding ground are thoroughly saturated.
2.9mm today and 1.5mm forecast tomorrow mean there is no drying window currently available.
The north-facing orientation receives negligible direct sun, significantly slowing evaporation of surface moisture.
Average humidity of 86% over the past week severely limits evaporative drying even with wind.
Consistent 20–35 km/h winds at this exposed ridge help strip surface water from the rock face.
Whin Sill dolerite does not absorb moisture, so it can dry within hours once rain stops and humidity drops.
Average temperatures of 10.5°C over the past week are below seasonal norms, reducing evaporation rates.
Recommendations
3
- Wait for at least one full dry day with dropping humidity before visiting — June 14 looks like the first realistic window but will need on-site assessment.
- If visiting after a dry spell, test friction carefully on lower-angle rock before committing to steeper routes, as dolerite can retain a thin moisture film that is invisible but treacherous.
- Check the BMC RAD for any active peregrine nesting restrictions before planning a trip.
Do Not Climb
88%
6 days ago
Crag Lough is currently receiving intermittent rain throughout today with near-saturated humidity (92–99%), and the rock will be thoroughly wet and extremely slippery. Although dolerite doesn't suffer structural damage when wet, the dense black rock offers virtually no friction in these conditions, making climbing dangerous.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north-facing aspect at 260m means the crag receives no direct sun to aid drying, so surface moisture persists far longer than on south-facing dolerite venues.
- The exposed ridge position delivers strong winds (currently ~30 km/h SW) which will help strip surface water once rain stops, but today's persistent drizzle and near-100% humidity negate this advantage.
- Peregrine falcons nest here in spring — by mid-June nesting restrictions may still apply; check the BMC RAD before visiting.
- The Whin Sill dolerite is notoriously slick when damp — the dense, glassy surface acts almost like wet glass, and even residual moisture film from high humidity can reduce friction significantly.
Warnings
2
- The rock is actively wet and dolerite is extremely slippery in these conditions — falls on wet whinstone are a serious risk.
- Loose blocks at the crag base may be destabilised by the prolonged wet spell; be vigilant when approaching and belaying.
Reasoning
The rock is currently wet from ongoing intermittent rain today (4.7 mm total) following a very wet 10-day period (over 50 mm since June 1st), with humidity at 92–99% preventing any meaningful evaporation.
Despite the exposed position and moderate winds, the north-facing aspect and persistent cloud cover at 100% mean drying cannot begin until rain fully ceases — strong westerly winds tomorrow (37 km/h) should strip surface water relatively quickly once precipitation eases.
Dolerite is non-porous and does not weaken when wet, but the recent prolonged wet spell increases the risk of loose blocks at the crag base due to active water infiltration into joints.
Early June should offer reasonable conditions, but this spell of unsettled Atlantic weather with temperatures averaging only 10–13°C is unusually cool and wet, delaying any meaningful drying.
Contributing Factors
7
Intermittent rain throughout today totalling 4.7 mm means the rock surface is actively wet right now.
Humidity of 92–99% with 100% cloud cover prevents any surface drying even during dry spells between showers.
Over 50 mm of rain since June 1st has saturated the ground and cliff-top vegetation, feeding seepage lines on the north face.
Strong winds (23–37 km/h forecast) will rapidly strip surface water from the dolerite once rain stops and humidity drops.
No direct sunlight reaches the crag face, so drying relies entirely on wind and ambient temperature rather than solar heating.
Dolerite does not absorb water so requires no internal drying time — surface conditions are all that matter.
From June 13th onwards humidity drops to 64–73% with no rain forecast, suggesting conditions will improve markedly by the weekend.
Recommendations
3
- Do not climb today — the rock is actively wet and the dense dolerite will be dangerously slippery.
- Target Saturday June 14th or later when dry weather, lower humidity (66%), and moderate winds should leave the surface dry and grippy.
- Check the BMC RAD for any active peregrine nesting restrictions before visiting, as restrictions can extend into June.
Do Not Climb
90%
8 days ago
Crag Lough is receiving persistent rain today (11mm total) following a very wet week (45mm in 7 days), and the rock will be wet and extremely slippery throughout the day. Although dolerite doesn't suffer structural damage when wet, the dense black surface offers almost no friction when damp, making climbing unsafe.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north-facing aspect at 260m means the crag receives no direct sun to aid drying, relying entirely on wind exposure to shed surface moisture.
- Crag Lough sits on the Whin Sill escarpment where cliff-top boggy ground and drainage from Hadrian's Wall ridge can feed persistent seepage lines down the face for days after heavy rain.
- Peregrine falcons nest here in spring — check BMC RAD for any remaining seasonal restrictions into early June as birds may still be fledging.
- Loose blocks at the crag base are a heightened hazard after the prolonged wet spell; saturated ground and freeze-thaw weakening over winter may have destabilised material.
Warnings
3
- Dolerite is extremely slippery when wet — friction loss is severe and falls are likely on even moderate routes.
- Loose blocks at the crag base may be destabilised after the prolonged wet period; exercise caution on approach.
- Check for peregrine falcon nesting restrictions which may still be in effect.
Reasoning
The rock is currently wet from ongoing showers throughout the day, compounded by nearly 45mm of rain in the past week and high ambient humidity (86%).
Despite strong westerly winds (~29 km/h) aiding surface evaporation, intermittent showers are preventing any meaningful drying, and the north-facing aspect receives no direct solar warming.
Dolerite does not weaken structurally when wet, but the prolonged wet spell may have loosened blocks at the crag base through water infiltration into joints.
Early June should offer improving conditions, but an unsettled Atlantic pattern has brought unusually persistent rain; peregrine nesting restrictions may still apply.
Contributing Factors
6
Showers are forecast throughout most of the day totalling 11mm, with only a brief 2–3 hour dry window mid-afternoon.
Nearly 45mm fell in the last 7 days across multiple rain events, keeping the crag and surrounding ground saturated.
Humidity has averaged 85% over the past week and remains above 80% today, inhibiting surface drying.
Sustained westerly winds of 23–29 km/h at the exposed ridge will accelerate surface drying once rain stops.
The crag receives no direct sunlight, eliminating solar warming as a drying mechanism.
Water sits on the surface rather than being absorbed, so the rock can dry within hours of rain ceasing given adequate wind.
Recommendations
3
- Do not climb today — the rock will be wet and dangerously slippery throughout.
- Target June 12th onwards when a dry spell with lower humidity and strong winds should allow the crag to dry fully.
- Check BMC RAD for any active peregrine nesting restrictions before visiting, as fledging may still be underway in early June.
Marginal — Assess Conditions
60%
9 days ago
After a very wet week (46mm in 7 days) and rain this morning, the non-porous dolerite could dry sufficiently for a late-afternoon window today given strong SW winds and clearing skies, but the north-facing aspect and high humidity mean residual dampness is likely. Climbers should visually inspect the rock surface for moisture before committing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Crag Lough is a peregrine nesting site — check for seasonal bird restrictions (typically February–June) via the BMC RAD before visiting.
- The north-facing aspect at 260m receives virtually no direct sun, so drying relies almost entirely on wind; the exposed ridgeline position helps significantly.
- Seepage from the boggy ground above Hadrian's Wall can persist for days after heavy rain, creating localised wet streaks even when the main face appears dry.
- The crag sits on a UNESCO World Heritage Site — access is permissive and sensitive; climbers should minimise impact and avoid disturbing archaeology or wall infrastructure.
Warnings
2
- Dolerite is exceptionally slippery when wet — a surface that looks dry can still have a thin moisture film that dramatically reduces friction.
- Peregrine falcon nesting restrictions may be in effect — verify current access status before climbing.
Reasoning
Heavy rain from June 1–4 (49.5mm) followed by continued light showers through today means the rock surface has been repeatedly re-wetted and is currently damp.
Strong SW winds (23–26 km/h) and dropping humidity through the afternoon today should strip surface moisture from the exposed dolerite within a few hours of the last rain stopping around 09:00, but the north-facing aspect receives no direct sun to assist.
Whin Sill dolerite is non-porous and does not suffer structural weakening when wet, but loose blocks at the crag base are an ongoing hazard exacerbated by recent freeze-thaw cycles over winter.
Early June is within the peregrine nesting season, which may restrict access to certain buttresses; otherwise, conditions are seasonally reasonable despite the recent wet spell.
Contributing Factors
7
Over 46mm fell in the past 7 days including 10–17mm days from June 1–4, keeping the crag environment saturated.
Whin Sill dolerite does not absorb water, so surface moisture can be wind-stripped within hours rather than days.
Sustained 23–28 km/h SW–W winds on the exposed ridgeline will rapidly clear surface water from the rock face.
No direct sun reaches the face, removing the most effective drying mechanism and leaving wind as the sole drying agent.
Average humidity of 85% over the past week slows evaporation and may keep the rock feeling greasy even after rain stops.
Rain ceases by 09:00 today with humidity dropping to 55% by early afternoon, creating a potential dry window from midday onward.
7.8mm forecast for tomorrow and continued intermittent showers through June 13 mean conditions will remain unsettled.
Recommendations
3
- If visiting today, wait until at least midday and physically check the rock surface for residual moisture before climbing — dolerite becomes extremely slippery when even slightly damp.
- Check the BMC RAD for current peregrine nesting restrictions at Crag Lough, as restrictions typically apply February through June.
- Avoid routes near seepage lines or the crag base where drainage from the boggy ground above Hadrian's Wall may persist for days after heavy rain.
Do Not Climb
85%
10 days ago
Crag Lough has received over 50mm of rain in the last week with further precipitation today and every day in the forecast. The north-facing dolerite will be persistently wet and extremely slippery, with no drying window in sight.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north-facing aspect receives virtually no direct sun, meaning surface moisture from rain, seepage, and condensation lingers far longer than on south-facing Whin Sill crags.
- Seepage from the grassy Hadrian's Wall ridge above feeds persistent weep lines down the buttresses for days after heavy rain, even though the rock itself is non-porous.
- Active loose blocks at the crag base are a heightened hazard after prolonged wet and freeze-thaw periods — the recent heavy rain may have destabilised material.
- Peregrine falcons nest here in spring; by early June nesting restrictions may still apply — check the BMC RAD before visiting.
Warnings
3
- Wet dolerite is extremely slippery — friction loss is severe and falls are likely on even moderate grades.
- Loose blocks at the crag base are a heightened hazard after prolonged saturation; approach with caution.
- Persistent seepage from the grassy ridge above will keep sections of the crag wet even after surface rain dries.
Reasoning
With 53.5mm in the last seven days, 1.7mm today, and humidity averaging 88%, the rock surface and surrounding drainage will be thoroughly wet.
Despite strong winds (22–35 km/h) aiding evaporation, the north-facing aspect at 260m with near-zero consecutive dry days and persistent cloud cover means effective drying has not occurred.
Dolerite does not weaken structurally when wet, but inherently loose blocks at the crag base may be destabilised by saturated ground and recent heavy rainfall.
Early June should offer improving conditions, but this spell of unsettled Atlantic weather with daily rain and cool temperatures (averaging ~12°C) is delaying any meaningful drying.
Contributing Factors
7
Over 50mm has fallen in the past week across multiple consecutive wet days, keeping the crag and its drainage thoroughly saturated.
Today has recorded 1.7mm with 87% humidity, continuing the unbroken run of wet days.
The north-facing orientation receives minimal direct sun, significantly slowing surface drying even between showers.
Sustained winds of 22–35 km/h across the exposed Whin Sill ridge help strip surface moisture from the rock.
Whinstone does not absorb water and can dry rapidly once rain stops, but persistent rain negates this advantage.
Every day from tomorrow through June 12 shows rain (5–7mm per day), with no meaningful drying window forecast.
Humidity has averaged 88% over the past week, suppressing evaporation and promoting condensation on the cold north-facing rock.
Recommendations
3
- Do not visit Crag Lough until a sustained dry spell of at least 24–48 hours arrives — the earliest possible window is June 13 if conditions verify dry.
- If you are in the area and conditions unexpectedly clear, test friction carefully on low-level holds before committing — wet dolerite is treacherously slippery.
- Check the BMC RAD for any remaining peregrine nesting restrictions before planning a visit.
Do Not Climb
65%
11 days ago
Despite dolerite's non-porous nature, the crag has received over 50mm of rain in the past week with further precipitation today and forecast for the coming days; combined with 87% average humidity, a north-facing aspect, and high-altitude cooling, surfaces are likely to remain damp and extremely slippery. We recommend waiting for a sustained dry spell before visiting.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The north-facing aspect at 260m receives virtually no direct sun, so even non-porous dolerite relies almost entirely on wind for surface drying.
- Persistent seepage from the grassy Hadrian's Wall ridge above can weep down the crag face for days after heavy rain, even though the rock itself doesn't absorb water.
- Crag Lough is a peregrine nesting site — check for seasonal bird restrictions before visiting, particularly through late spring.
- Loose blocks and active freeze-thaw debris at the base are a year-round hazard, especially after the recent prolonged wet spell which may have loosened material.
Warnings
3
- Dolerite is extremely slippery when wet — a fall due to friction loss is the primary risk in these conditions.
- Loose blocks at the crag base may have been further destabilised by the prolonged wet spell; be vigilant below the cliff line.
- Ground above the crag is saturated; seepage lines may persist even after the rock surface appears dry.
Reasoning
With 52.7mm in the past 7 days, 1.8mm today, and 90% humidity, surface moisture and residual runoff from the saturated ground above will keep the rock face damp in many areas.
The exposed position and moderate winds (20–35 km/h) would normally dry dolerite surfaces within hours, but the north-facing aspect, persistent cloud, and continuous light rainfall mean drying is repeatedly interrupted and incomplete.
Dolerite is not structurally weakened by moisture, but the prolonged wet period may have loosened perched blocks at the crag base through water infiltration into cracks.
Early June should be favourable, but an unseasonably wet and cool spell with temperatures averaging only 11.8°C is suppressing evaporation and maintaining high ambient moisture.
Contributing Factors
6
Over 50mm in the past week, with the heaviest falls (10–17mm/day) in the last five days, has saturated the ground and kept rock surfaces repeatedly wetted.
Whin Sill dolerite does not absorb water and can dry within hours of rain stopping, meaning structural damage is not a concern.
The north-facing orientation receives negligible direct sunlight, removing solar heating as a drying mechanism and leaving wind as the only effective drying agent.
Average humidity of 87% over the past week severely limits evaporative drying, and at 260m the crag may sit in low cloud or mist.
Strong winds of 20–35 km/h across the exposed Whin Sill ridge will accelerate surface drying whenever rain pauses.
Rain is forecast on each of the next five days (1–6mm/day), preventing any sustained drying window from developing.
Recommendations
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- Wait for at least 24 hours of dry weather with wind before visiting — dolerite dries quickly once rain stops, but the current pattern offers no sustained dry window.
- If you do visit, test friction carefully on lower holds before committing to any route; the black dolerite becomes glass-like when damp.
- Check for current peregrine nesting restrictions and any Hadrian's Wall Heritage Site access notes before travelling.
Climbing Outlook