Condition Analysis
AI-powered assessment using site data and 14-day weather history
Callerhues is thoroughly saturated after a prolonged wet spell — 70mm over the last 28 days with almost continuous rain over the past two weeks, including heavy falls on June 2–4 (35mm in three days) and repeated showers since. Today has added further rain and the forecast offers no meaningful dry window for the next five days. The rock will be deeply wet internally despite any brief surface drying.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The crag has received rain on 12 of the last 14 days with no consecutive dry day exceeding one, meaning the porous Fell Sandstone has had zero opportunity to shed deep moisture despite the exposed hilltop position.
- At 323m on open moorland, the 40-minute boggy approach via the Pennine Way will itself be extremely wet and unpleasant — if the ground at the base is sodden, the rock is certainly still saturated internally.
- The SW aspect and exposed wind would normally aid drying significantly, but persistent high humidity (averaging 86% over the last week) and 100% cloud cover today severely limit evaporative drying.
- Bold, committing routes with small iron-oxide holds are especially dangerous on weakened wet sandstone — hold breakage risk is acute given the cumulative saturation.
Warnings
3
- Climbing on this deeply saturated Fell Sandstone risks permanent hold breakage and irreversible route damage — the community ethic is unambiguous: do not climb.
- The bold, committing nature of the routes (highball bouldering, sparse gear) makes the safety risk from weakened holds especially severe.
- The approach across open moorland at 323m will be very boggy and conditions could deteriorate rapidly with forecast rain.
Reasoning
The rock is deeply saturated following 70mm of rain over 28 days with almost no dry intervals; the last significant dry spell ended on May 29, and repeated wettings since have kept internal moisture at or near critical levels.
Despite the SW aspect and exposed position, average humidity of 86%, temperatures around 9–13°C, and near-continuous cloud cover have allowed virtually no effective drying over the past two weeks.
With the sandstone likely at or above 60% pore saturation from prolonged wetting, compressive strength may be reduced by 30%+ and small iron-oxide holds are at serious risk of breakage — climbing now would cause permanent damage.
Early June should be approaching prime season, but this has been an exceptionally wet period; the prolonged saturation means the rock will need several consecutive dry days with lower humidity before conditions recover.
Contributing Factors
6
70mm over 28 days with 35mm in just three days (June 2–4) and repeated showers since have deeply saturated the porous sandstone.
Rain has fallen on 12 of the last 14 days with no two-day dry window, far short of the minimum 48–72 hours needed after heavy rain.
Average humidity of 86% over the last week with today at 94% severely limits evaporative drying even on this exposed hilltop.
Today has delivered 2.9mm with further showers forecast, and the next five days show continued precipitation totalling ~20mm with no dry spell.
Normally strong positives for drying, but rendered ineffective by persistent high humidity, cloud cover, and continuous re-wetting.
The 7-day average of 9.4°C is well below seasonal norms for mid-June, further slowing evaporation and drying.
Recommendations
3
- Do not visit Callerhues until at least 3 consecutive dry days with humidity below 75% have occurred — the rock needs extended drying after this prolonged wet spell.
- Monitor conditions remotely; the boggy Pennine Way approach will be a reliable proxy — if the moor is waterlogged, the crag is certainly too wet.
- Consider non-porous alternatives in the region (e.g. whinstone crags like the Great Whin Sill venues) if you need a climbing fix during this wet period.
Previous Analyses
Do Not Climb
92%
2 days ago
Callerhues has received nearly 19mm of rain in the last 7 days across multiple events, with no meaningful dry spell — the last fully dry day was only yesterday (June 14, 0.0mm) following weeks of persistent wet weather totalling 68mm over 28 days. With further rain falling today and forecast daily through June 20, the porous Fell Sandstone will remain saturated and unsafe to climb on for the foreseeable future.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The prolonged wet spell from June 1–13 (nearly 50mm across repeated events) will have deeply saturated the sandstone, meaning even a single dry day cannot meaningfully reduce internal moisture.
- At 323m on open moorland, the boggy approach via the Pennine Way will be extremely wet and unpleasant, adding practical difficulty beyond the rock condition itself.
- Despite the exposed SW aspect normally aiding drying, persistent humidity above 80% and cool temperatures (~9°C average) over the past week have severely limited evaporative drying.
- The crag's bold, committing routes with limited protection make damp conditions especially dangerous — a hold snapping on an E-grade route with sparse gear could be catastrophic.
Warnings
3
- Climbing on saturated Fell Sandstone risks permanent hold breakage and irreversible route damage — this crag has been wet for weeks.
- The boggy Pennine Way approach will be waterlogged and difficult; allow extra time and wear appropriate footwear.
- Today's rain from 19:00 onwards will re-wet any minor surface drying achieved during the afternoon dry window.
Reasoning
The rock is almost certainly saturated internally: 68mm of rain over 28 days with repeated wetting events and only isolated dry days means the sandstone has had no opportunity to dry below the critical moisture threshold.
Despite the SW aspect and exposed position, sustained humidity of 85% average over the last week and temperatures averaging only 9°C have provided minimal evaporative potential, and the single dry day on June 14 is entirely insufficient after weeks of cumulative wetting.
With prolonged saturation likely well above 60% pore capacity, compressive strength is reduced by an estimated 30–50%, creating serious risk of hold breakage on the iron-oxide-cemented features that define Callerhues' climbing.
Although it is early summer, this June has been unusually wet and cool for the season, and the forecast shows no dry window of sufficient length to allow adequate drying before at least June 21.
Contributing Factors
6
68mm over 28 days with repeated wetting events has deeply saturated the porous sandstone well beyond surface level.
Only one fully dry day (June 14) in the past two weeks is far short of the minimum 48–72 hours needed after heavy rain.
Average humidity of 85% over the last week severely limits evaporative drying even with wind exposure.
Average temperature of only 9°C over the past week slows evaporation significantly compared to typical summer conditions.
Normally a strong positive for drying, but rendered ineffective by the persistent humidity, cloud cover, and continued rainfall.
Rain is forecast every day from June 16–20, adding another ~19mm and preventing any meaningful drying window.
Recommendations
3
- Do not visit Callerhues until at least 2–3 consecutive dry days with humidity below 75% follow the current wet spell.
- Monitor the forecast beyond June 21 — the first dry day appears to be June 21 but a single day is insufficient; you need at least 48 hours of dry weather.
- If desperate to climb this week, consider non-porous alternatives such as whinstone crags (e.g. Great Wanney, Crag Lough) which are less vulnerable to moisture damage.
Do Not Climb
90%
3 days ago
Callerhues has received persistent rain over the past two weeks (65.9mm in 28 days, 20.5mm in the last 7 days alone) with only one dry day since the last rainfall on June 13. The rock will be thoroughly saturated internally despite today's dry weather, and more rain is forecast from tomorrow, making conditions clearly unsuitable for climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The crag has experienced an exceptionally wet period from June 1–13 with rain on almost every day, meaning cumulative saturation will be deep within the porous Fell Sandstone — far beyond what a single dry day can address.
- Despite the exposed SW aspect that normally aids drying, average temperatures have been only ~9.5°C with humidity averaging 84% over the past week, severely limiting evaporative drying potential.
- The boggy moorland approach (40-minute Pennine Way walk) will itself be waterlogged after this prolonged wet spell — if the ground at the crag base is wet, the rock is certainly still saturated internally.
- At 323m altitude in an unsettled pattern, the crag will be in and out of low cloud, further suppressing drying despite the exposed position.
Warnings
2
- Climbing on this deeply saturated Fell Sandstone risks permanent and irreversible hold breakage — the iron oxide holds that define Callerhues' routes are especially vulnerable when wet.
- The surface may appear dry in sunny patches while the interior remains saturated — do not be deceived by surface appearance after such a prolonged wet period.
Reasoning
With rain falling on 10 of the last 13 days totalling over 50mm, and only one dry day since the most recent rain (0.9mm on June 13), the sandstone will be deeply and thoroughly saturated well beyond the critical 1% threshold where significant weakening begins.
One dry day with moderate wind (18.4 km/h from the north — not hitting the SW face directly) and cool temperatures (max 14.3°C) at 78% humidity is wholly insufficient to dry porous Fell Sandstone after such a prolonged wet period; a minimum of 3–5 dry days would be needed.
The cumulative saturation from nearly two weeks of repeated wetting places the rock at high risk of hold breakage and grain loosening, with compressive strength likely reduced by 30%+ throughout the crag.
Although it is nominally early summer, the persistent cool and wet weather pattern is performing more like a poor spring, with temperatures well below seasonal averages and no sustained drying windows in sight.
Contributing Factors
6
Rain fell on 10 of the last 13 days accumulating over 50mm, deeply saturating the porous sandstone far beyond surface level.
Only one dry day since the last rain is far short of the minimum 48–72+ hours required after heavy cumulative precipitation on Fell Sandstone.
Average humidity of 84% over the past week severely limits evaporative drying even with wind exposure.
Average temperature of only 9.5°C over the past week slows evaporation and internal drying significantly.
The exposed hilltop position and SW aspect catch wind and sun, which will help once a sustained dry spell arrives — but one day is not enough.
3.8mm forecast tomorrow followed by further rain on June 16–18 means no sustained drying window is available in the coming days.
Recommendations
3
- Do not climb today or in the coming days — the rock is deeply saturated from nearly two weeks of persistent rain and needs a sustained dry spell of at least 3–5 days to recover.
- Monitor the forecast beyond June 20; if a genuine dry window of 3+ days with lower humidity materialises, reassess conditions then.
- On any future visit, check the ground at the crag base — if the moorland and crag foot are still damp, the rock is certainly too wet internally regardless of how dry the surface appears.
Do Not Climb
90%
4 days ago
Callerhues has received almost continuous rainfall over the past two weeks (65.8mm in 28 days, 22.7mm in the last 7 days alone), with rain as recently as today (0.8mm) and significant falls on June 11 (7.4mm) and June 12 (3.1mm). Despite the exposed, SW-facing aspect, the persistently high humidity (85% average over 7 days), cool temperatures (~10°C average), and lack of any meaningful dry spell mean the sandstone will be thoroughly saturated internally — climbing today or in the immediate future risks serious hold damage and is unsafe.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Callerhues sits at 323m on open moorland where temperatures have averaged only ~10°C recently, significantly slowing evaporation despite good wind exposure.
- The approach via the Pennine Way crosses notoriously boggy ground — if the path is waterlogged, the crag base will also be wet, confirming internal saturation of the rock.
- The prolonged wet period from June 1–13 (rain on 10 of 13 days totalling ~43mm) means deep pore saturation that will take multiple consecutive dry days to resolve, far beyond what the surface appearance might suggest.
- Despite the SW aspect and exposed position giving above-average drying potential, the cumulative moisture loading from weeks of near-daily rain overwhelms those advantages at this point.
Warnings
3
- The rock surface may appear dry before the interior has dried — do NOT trust surface appearance after this prolonged wet period; iron-oxide holds are at genuine risk of snapping.
- The extended wet spell (65.8mm over 28 days with rain on most days) means deep pore saturation that requires significantly longer drying than a single rain event.
- Rain is forecast to return on June 16–18, likely preventing any adequate drying window in the coming week.
Reasoning
The rock is almost certainly saturated deep into the pore structure after rain on 10 of the last 13 days (cumulative ~43mm since June 1), with today's 0.8mm preventing any meaningful drying reset.
Although the SW aspect and strong winds (37 km/h today) promote surface evaporation, the persistent high humidity (79–94%) and cool temperatures (~10°C) drastically limit net drying, and there has been zero consecutive dry days to begin the process.
With deep internal saturation from prolonged wetting, compressive strength is likely reduced by 30%+ across much of the crag; the iron-oxide cemented holds that define Callerhues routes are at serious risk of breakage under load.
Early June should offer improving conditions, but this year's pattern has been unusually wet and cool for the season, negating the expected summer drying advantage.
Contributing Factors
6
Rain has fallen on 10 of the last 13 days totalling ~43mm, with an additional 22.7mm in the week before that, deeply saturating the porous Fell Sandstone.
Today received 0.8mm and yesterday 3.1mm, meaning the critical drying clock has not even started — a minimum of 2 full dry days is needed after even light rain.
Average humidity over the past 7 days is 85%, severely limiting net evaporation even with wind exposure.
Average temperatures around 10°C over the past week provide minimal thermal energy to drive moisture out of the rock.
Sustained winds of 20–37 km/h on the exposed hilltop help move moist air from the rock surface, but cannot overcome the humidity and saturation levels.
The south-west facing aspect receives good afternoon sun which aids surface drying, though cloud cover in recent days has limited this benefit.
Recommendations
3
- Do not climb at Callerhues until at least 2 full consecutive dry days with humidity below 80% have elapsed — currently the earliest realistic window might be June 15 if the forecast holds, but check conditions on arrival.
- Use the boggy approach as a ground-truth indicator: if the moorland path is waterlogged, the crag base will be wet and the rock is certainly still saturated internally.
- Monitor updated forecasts closely — the current outlook shows rain returning on June 16, which would reset the drying clock again.
Do Not Climb
92%
5 days ago
Callerhues has received 25mm of rain in the last 7 days with no consecutive dry days, and today alone saw 4.5mm — the rock is almost certainly saturated internally despite any surface drying between showers. The prolonged wet spell since early June (66mm over 28 days), combined with high humidity averaging 87%, means the porous Fell Sandstone has had no opportunity to dry adequately.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The exposed hilltop position and SW aspect are helpful for drying, but with rain falling almost every day since June 1st the crag has had no meaningful drying window — wind and sun cannot overcome continuous re-wetting.
- At 323m altitude, temperatures have been cool (averaging under 10°C over the past week), significantly slowing evaporation rates from this porous sandstone.
- The 40-minute boggy moorland approach via the Pennine Way will itself be very wet and unpleasant after this prolonged rain, and ground moisture at the crag base is a reliable indicator that the rock remains damp internally.
- The cumulative 66mm over 28 days represents a sustained wetting period — even the earlier dry spell in mid-May was negated by the heavy rain from June 1st onward, meaning the rock has been repeatedly saturated to depth.
Warnings
3
- Climbing on saturated Fell Sandstone risks permanent, irreversible damage to holds — the iron oxide features that define Callerhues' routes are especially fragile when wet.
- The surface may appear dry before the interior has dried — do not be deceived by a dry-looking face after only one dry day.
- The boggy Pennine Way approach will be treacherous in current conditions; plan for slow, muddy going and appropriate footwear.
Reasoning
With 25mm in the last 7 days spread across multiple events and 4.5mm today, the rock is saturated or near-saturated internally — well above the critical ~1% water content threshold where significant weakening begins.
Despite the SW aspect and exposed position providing good drying potential, the absence of any consecutive dry days and persistent high humidity (84–94%) mean evaporation has been negligible between rain events.
At estimated saturation levels, compressive strength is likely reduced by 30%+ (Bell, 1978), making iron-oxide-cemented holds — the small features Callerhues routes depend on — highly vulnerable to breakage under climbing loads.
Early June should offer improving conditions, but this year's pattern of persistent rainfall and below-average temperatures has kept the rock in a quasi-winter moisture state despite the calendar date.
Contributing Factors
6
25mm over the past 7 days with rain on every single day and 66mm over 28 days has kept the sandstone in a continuously saturated state.
The rock has not had a single full dry day since June 1st, preventing any meaningful drying cycle from completing.
Average humidity of 87% over the last week severely limits evaporative drying even when rain is not actively falling.
Average temperature of just 9.8°C over the past week at 323m altitude significantly slows evaporation compared to warmer lowland conditions.
The hilltop exposure and south-westerly aspect maximise wind and solar drying potential, which will help once a dry spell arrives.
Winds of 30+ km/h today and 36+ km/h forecast tomorrow will aid surface drying, though insufficient alone to dry saturated rock.
Recommendations
3
- Do not climb today or in the immediate future — wait for at least 2 full consecutive dry days with humidity below 80% before considering a visit.
- Monitor the forecast beyond June 14th; if June 14–15 remain dry as forecast, conditions might begin to improve by June 16th, but further rain is predicted that day.
- On arrival, check the ground at the crag base — if it is damp rather than sandy-dry, the rock is still too wet to climb regardless of how the surface appears.
Do Not Climb
93%
6 days ago
Callerhues has received nearly 60mm of rain over the past four weeks, with significant falls on June 1–4 (over 34mm in three days) and continued intermittent rain almost daily since, including 4.3mm today. The rock will be thoroughly saturated internally despite its exposed, SW-facing position; climbing today or tomorrow would risk permanent hold damage on this porous Fell Sandstone.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The 40-minute boggy Pennine Way approach will itself be very wet after this prolonged rainy spell, making access unpleasant and adding to the sense that the crag environment is saturated.
- At 323m on open moorland, the crag benefits from strong wind exposure (SW aspect into prevailing winds), which is the single most helpful drying factor here — but it cannot overcome persistent re-wetting every 1–2 days.
- The bold, committing nature of routes (highball bouldering and trad with minimal gear) means any hold failure from damp rock has severe safety consequences with limited fall protection.
- Cumulative rainfall of ~17mm in the last 7 days and ~59mm over 28 days means even deeper pore structures within the sandstone are likely near saturation — surface drying will be misleading.
Warnings
2
- Climbing on this rock now risks permanent hold breakage — Fell Sandstone at near-full saturation can lose 30–50% of its compressive strength, and the small iron-oxide holds will not survive repeated loading.
- The bold, highball nature of many routes here means a broken hold could result in a serious ground fall with minimal protection.
Reasoning
The rock has been repeatedly wetted over the past 10+ days with no consecutive dry period longer than one day, meaning the sandstone's pore network is likely near its ~87–90% saturation ceiling and internal moisture levels are very high.
Despite the SW aspect and strong wind exposure (20–30+ km/h), the rock has had virtually no opportunity to begin meaningful drying because rain has fallen on 8 of the last 10 days, with today adding another 4.3mm; the drying clock effectively resets with each wetting event.
With the sandstone likely at or near critical saturation, compressive strength could be reduced by 30–50%, making iron-oxide-cemented holds — the small crimps and edges Callerhues is known for — highly vulnerable to breakage under body weight.
Early June temperatures around 10–14°C are moderate but the persistently high humidity (85% average over 7 days, 91% today) severely limits evaporative drying potential.
Contributing Factors
7
Rain has fallen on 8 of the last 10 days totalling ~17mm, with heavier falls of 35mm from June 1–4, keeping the sandstone continuously saturated with no meaningful drying window.
4.3mm of rain today (mostly mid-morning through early afternoon) means the drying clock has not even started yet.
Average humidity of 85% over the past week and 91% today severely limits evaporative drying from the rock surface even in wind.
Sustained winds of 20–34 km/h at this exposed hilltop site will aid surface drying once rain stops, but cannot overcome ongoing re-wetting.
The south-west facing aspect provides good afternoon solar radiation in June, which will help once skies clear, but 100% cloud cover today negates this benefit.
Nearly 59mm over 28 days with repeated wetting means moisture has penetrated deep into the pore network, requiring an extended dry spell well beyond the usual 48–72 hours to reach safe internal moisture levels.
Average temps around 10°C at 323m elevation slow evaporation rates compared to warmer lowland conditions.
Recommendations
3
- Do not climb at Callerhues until at least 3 full dry days have passed with humidity consistently below 80% — the forecast suggests June 15 at the earliest for an on-site assessment.
- Before committing to the 40-minute approach, check that the moorland ground around the crag base is sandy-dry, not just surface-dry — if the ground is damp, the rock is certainly still wet internally.
- If conditions look marginal on arrival, test lower, less-valued sections of rock first and check for any darkened patches, damp seams, or gritty texture under fingertips before committing to routes.
Do Not Climb
95%
8 days ago
Callerhues has received over 34mm of rain in the last 7 days, including heavy falls on June 1–4 and continued showers through today (June 9), with no consecutive dry days recorded. The porous Fell Sandstone will be thoroughly saturated internally despite any surface drying between showers, and further rain is forecast through June 11 — conditions are clearly unsafe for climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The 40-minute approach via the Pennine Way crosses boggy moorland that will be extremely waterlogged after 53mm in 28 days, adding time and effort — wet approach ground is also a reliable indicator that the crag itself is still holding moisture.
- At 323m on open moorland, low cloud and hill fog are common in the current unsettled pattern, which keeps humidity near saturation and virtually halts drying even when rain stops.
- The SW aspect and exposed hilltop position are normally strong drying assets, but with persistent rain every 1–2 days and average humidity of 85% over the last week, the crag has had no meaningful drying window.
- The heavy rain event of June 1–4 (~35mm over three days) will have driven moisture deep into the sandstone; subsequent lighter showers have prevented any significant internal drying from beginning.
Warnings
3
- Fell Sandstone loses up to 50% of its compressive strength when saturated — climbing now risks snapping holds and causing irreversible route damage.
- The rock surface may appear dry between showers but the interior will remain saturated; do not be fooled by brief dry spells in the current pattern.
- The boggy moorland approach will be treacherous in current conditions — allow extra time and wear appropriate footwear.
Reasoning
With 34mm in the last 7 days, rain falling on 6 of the past 7 days (including today), and no consecutive dry days, the sandstone will be at or near full saturation throughout its depth.
Although the SW aspect and exposed position with winds of 20–34 km/h would normally aid drying, the near-continuous rainfall and average 85% humidity over the past week have prevented any meaningful evaporative drying from occurring.
At near-full saturation the sandstone will have lost 30–50% of its compressive strength, making iron-oxide cemented holds highly vulnerable to breakage — climbing now risks permanent route damage.
Early June should offer improving conditions, but this prolonged unsettled spell with below-average temperatures (~10.5°C average) has kept the rock in a winter-like moisture state despite the calendar date.
Contributing Factors
7
Over 34mm in 7 days with rain on 6 of 7 days, including a 35mm event over June 1–4, has thoroughly saturated the porous sandstone.
Zero consecutive dry days means the rock has had no opportunity to begin the multi-day drying process Fell Sandstone requires.
Average humidity of 85% over the past week severely limits evaporative drying even during rain-free hours.
Average temperature of only 10.5°C over the last week reduces evaporation rates and slows internal moisture migration.
Sustained winds of 20–34 km/h on the exposed hilltop would significantly aid surface drying once rain stops, but have been insufficient to overcome continuous rewetting.
The south-west facing aspect receives good solar radiation in June, which will help once a dry spell establishes, but 100% cloud cover today negates this benefit.
Today has seen ~4mm of scattered showers, and a further 3–5mm is forecast for each of June 10 and 11, extending the saturation period.
Recommendations
3
- Do not visit Callerhues until at least June 14, allowing a minimum of two full dry days after the last forecast rain on June 11.
- Before committing to the 40-minute walk-in, check moorland ground conditions at the Pennine Way trailhead — if the path is waterlogged, the crag will still be wet internally.
- When conditions do improve, prioritise upper and overhanging sections first as they will dry quickest; avoid lower slab routes and any seepage-prone areas.
Do Not Climb
92%
9 days ago
Callerhues has received over 41mm of rain in the past 7 days, including heavy falls on June 1–4 and further rain today, with zero consecutive dry days — the sandstone will be deeply saturated internally despite any surface drying this afternoon. With more rain forecast every day through June 13, there is no adequate drying window in sight.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The 40-minute boggy Pennine Way approach will itself be very wet after 48mm in 28 days, making access unpleasant and confirming ground-level saturation that mirrors rock moisture.
- Despite the SW aspect and exposed hilltop aiding drying, the cumulative 34.8mm from June 1–4 followed by repeated further showers (June 6, 7, 8) means the rock has never had a chance to begin meaningful internal drying.
- At 323m altitude with average temps around 11°C and humidity averaging 86% over the past week, evaporative drying is significantly impaired compared to lowland conditions.
- Bold highball/trad routes with committing moves make wet or weakened holds especially dangerous — a snapped hold on these routes could result in a ground fall.
Warnings
3
- Fell Sandstone loses up to 50% of its compressive strength when wet — climbing now risks snapping holds and permanent route damage.
- The bold highball nature of Callerhues routes means any hold failure on saturated rock could result in a serious ground fall.
- The surface may appear dry during afternoon sun breaks while the interior remains deeply saturated — do not be deceived by surface appearance.
Reasoning
The rock is almost certainly saturated internally after 41.4mm in the past 7 days with no consecutive dry days, and the prolonged wet spell from June 1–4 (34.8mm over 3 days) has driven moisture deep into the porous Fell Sandstone.
Although the SW aspect and exposed hilltop with 20–30 km/h winds would normally aid drying, the persistent high humidity (86% average), cool temperatures (~11°C), and repeated re-wetting events every 1–2 days have prevented any meaningful drying from occurring.
With the sandstone likely above 60% pore saturation, compressive strength could be reduced by 30%+ and iron-oxide holds are at serious risk of breakage — climbing now risks permanent damage to irreplaceable routes.
Early June should offer improving conditions, but this has been an unusually wet period; temperatures are below seasonal norms and the extended forecast shows continued unsettled weather with no clear drying window.
Contributing Factors
6
41.4mm over the past 7 days including 34.8mm in a 3-day burst (June 1–4) has deeply saturated the porous sandstone.
Rain has fallen today (2.6mm) and on 4 of the last 5 days, preventing any meaningful drying cycle from beginning.
Average humidity of 86% over the past week severely limits evaporative drying even when rain pauses.
Average temperatures around 11°C at 323m slow the rate of moisture migration out of the rock compared to warmer conditions.
The exposed hilltop with SW aspect and consistent 20–30 km/h winds would accelerate drying if a sustained dry period materialises.
9.4mm is forecast tomorrow and further showers every day through June 13, preventing the 48–72+ dry hours needed after heavy rain.
Recommendations
3
- Do not visit Callerhues until at least 2–3 consecutive fully dry days have occurred after the current unsettled spell ends.
- Monitor the forecast beyond June 14 — if the dry weather materialises and continues, the exposed SW aspect should allow relatively quick drying for Fell Sandstone.
- If you are in the area and keen to climb, consider non-porous alternatives such as whinstone crags (e.g. Crag Lough, Peel Crag on the Whin Sill) which are far less moisture-sensitive.
Do Not Climb
95%
10 days ago
Callerhues has received nearly 47mm of rain over the past week with further rain today (4.9mm) and no meaningful drying window; the rock will be thoroughly saturated internally. The forecast shows continued unsettled weather with rain on most days through to at least June 12th, making safe climbing conditions unlikely for the foreseeable future.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The crag's exposed hilltop position and SW aspect are normally excellent for drying, but persistent high humidity (averaging 89% over the past week) severely limits evaporation even with decent wind.
- The 40-minute approach via boggy moorland will be extremely waterlogged after 47mm in a week — conditions underfoot are a useful proxy for rock saturation.
- At 323m altitude, temperatures are running cool (averaging 11.3°C) which further slows the drying of this porous Fell Sandstone.
- With ~47mm of cumulative rain in the last 7 days falling in multiple episodes, the rock will be saturated well beyond surface level — internal moisture will persist long after the surface appears dry.
Warnings
3
- Climbing on saturated Fell Sandstone risks permanent destruction of the small iron-oxide holds these routes depend on — damage is irreversible.
- The boggy 40-minute moorland approach will be treacherous in current conditions; take appropriate footwear and allow extra time.
- Multiple days of heavy rain increase the risk of loose or detached blocks — even dry-looking holds may be structurally compromised.
Reasoning
Multiple heavy rain events (12.5mm, 11.9mm, 10.4mm on consecutive days June 2–4, plus further rain June 6–7) have thoroughly saturated the porous Fell Sandstone, and with no consecutive dry days since, internal moisture levels will be extremely high.
Despite the exposed SW aspect and moderate winds (20–32 km/h), the persistently high humidity (89% average, peaking at 94%) and cool temperatures (~11°C) have prevented any meaningful drying between rain events.
At this level of saturation the sandstone will have lost an estimated 30%+ of its compressive strength, making iron-oxide holds — the small features these routes depend on — highly vulnerable to breakage.
Early June in Northumberland is transitioning into summer but this spell of cool, wet Atlantic weather is delivering winter-like moisture conditions that are atypical but not unusual for the region.
Contributing Factors
6
47mm in the past 7 days across multiple events has deeply saturated the porous sandstone with no drying window between showers.
Rain has fallen today and on most recent days, meaning the critical minimum 48–72 hour drying period after heavy rain has not even begun.
Average humidity of 89% over the past week drastically reduces evaporation rate, even with wind and favourable aspect.
Averaging just 11.3°C at 323m altitude slows drying significantly compared to warmer summer conditions.
Sustained SW winds of 20–34 km/h on an exposed hilltop would normally accelerate drying, but cannot overcome the persistent moisture input and high humidity.
A further 21mm of precipitation is forecast over the next 5 days with rain on 4 of 5 days, preventing any meaningful drying window from developing.
Recommendations
3
- Do not climb at Callerhues until at least 48–72 hours of dry weather with humidity below 80% have elapsed after the last rain — this is unlikely before mid-June at the earliest.
- Monitor the forecast for a settled dry spell of at least 3 days before planning a visit; even then, check the moorland approach — if the ground is boggy and wet, the rock is too.
- Consider alternative venues on non-porous rock (e.g. Whin Sill crags like Crag Lough or Great Wanney whinstone) during this wet spell.
Do Not Climb
93%
11 days ago
Callerhues has received nearly 45mm of rain over the past week, including heavy falls on June 1–4, with further rain today (4.1mm) and more forecast through to June 11. The rock will be deeply saturated with no meaningful drying window in sight — climbing is not appropriate.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The crag's exposed hilltop position and SW aspect are its best drying assets, but with near-continuous rain and humidity averaging 88% over the past week, even this advantage is overwhelmed.
- The 40-minute approach crosses boggy moorland that will be waterlogged after this prolonged wet spell — expect slow, muddy going and wet boots before you even reach the crag.
- At 323m altitude, temperatures have been cool (averaging ~11°C) which significantly slows evaporative drying of the porous Fell Sandstone.
- Bold, committing routes on small iron-oxide holds make Callerhues especially unforgiving if holds are weakened by internal moisture — the consequences of hold failure here are serious.
Warnings
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- Fell Sandstone loses up to 50% of its compressive strength when saturated — climbing now risks permanent hold destruction on irreplaceable routes.
- The rock surface may begin to look dry before the interior has dried; do not be deceived by surface appearance after such prolonged soaking.
- The boggy moorland approach will be waterlogged and slow; allow extra time and bring appropriate footwear.
Reasoning
With 44.7mm of rain in the last 7 days — including 12.5mm, 11.9mm, and 10.4mm on consecutive days (June 2–4) — followed by rain again today, the sandstone will be deeply saturated well beyond the critical 1% threshold where significant weakening begins.
The single dry day (June 5) with moderate wind and 74% humidity was wholly insufficient to dry rock soaked by 40mm+ of rain; the surface may have begun to dry but the interior remains saturated, and today's 4.1mm rain has re-wetted the surface.
With porosity up to 20.7% and sustained saturation over multiple days, compressive strength loss of 30–50% is likely; the small iron-oxide holds characteristic of Callerhues are at serious risk of breakage.
Early June conditions have been unusually cool and wet for the season, negating the typical summer drying advantage; temperatures around 12°C and high humidity are more reminiscent of late autumn drying rates.
Contributing Factors
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Over 44mm fell in the past week across multiple days, deeply saturating the porous sandstone.
Only one dry day (June 5) between the heavy rain and today's further precipitation — far short of the minimum 48–72 hours needed after heavy rain.
Average humidity of 88% over the past week severely limits evaporative drying, even with wind.
Temperatures averaging just 11.4°C over the past week slow drying significantly compared to warmer summer conditions.
Sustained winds of 20–34 km/h on the exposed hilltop help move moist air from the rock surface, but are insufficient to overcome the saturation and humidity.
Rain is forecast on each of the next five days (1.8–9.6mm), preventing any meaningful drying period from developing.
Recommendations
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- Do not visit Callerhues until there have been at least 2–3 consecutive fully dry days with humidity below 80% — the earliest realistic window might be after June 12 if the forecast holds.
- If you're set on climbing this week, consider non-porous alternatives such as the Whin Sill crags (Crag Lough, Peel Crag) which can handle wetter conditions, though surface grip should still be assessed.
- Check the moorland approach conditions before committing — after this much rain the boggy Pennine Way section will be extremely wet.
Climbing Outlook