Climbing Forecast › Snowdonia — Carneddau › Llech Ddu (Black Slab)

SNOWDONIA — CARNEDDAU · RHYOLITE

Llech Ddu (Black Slab) weather & climbing conditions

Poor — wet, too windy or closed

Right now

Temp2°C
Wind25 km/h
Gusts32 km/h
Humidity100%
Rain 48hdry
Last rainNone recent

Assessment

No recent rain
Windy — 28 km/h, gusts 37 km/h
Humidity 100% — likely fog/cloud
Cold — excellent friction but watch for damp seeping features
High humidity (100%) — rhyolite friction compromised, particularly for bouldering
Breezy — good for drying

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Sunday 1 November
Poor
Temp4°C
Rain0.2mm
Wind28 km/h
Gusts37 km/h
Humidity100%
No recent rainWindy — 28 km/h, gusts 37 km/hHumidity 100% — likely fog/cloud
  • Damp mountain air — upper pitches may stay greasy
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
09:00 2° dry 25 32 100%
12:00 4° dry 29 37 99.85%
15:00 4° dry 26 33 99.61%
18:00 4° 0.2mm 23 29 99.81%
21:00 4° dry 27 36 98.77%
Mon Monday 2 November
Caution
Temp1°C
Raindry
Wind37 km/h
Gusts50 km/h
Humidity92%
Should be dryWindy — 37 km/h, gusts 50 km/hHumidity 92% — potential fog
  • Cold mountain conditions — pack warm belay layers
  • Damp mountain air — upper pitches may stay greasy
  • Very windy — consider sheltered alternatives
Time °C Rain Wind (km/h) Gust Hum
06:00 1° dry 36 45 97.7%
09:00 0° dry 38 47 97.92%
12:00 1° dry 36 46 94.19%
15:00 2° dry 38 50 90.49%
18:00 2° dry 35 45 97.15%
21:00 1° dry 37 47 97.69%
Tue Tuesday 3 November
Caution
Temp2°C
Raindry
Wind35 km/h
Gusts52 km/h
Humidity93%
Should be dryWindy — 35 km/h, gusts 52 km/hHumidity 93% — potential fog
  • Cold mountain conditions — pack warm belay layers
  • Damp mountain air — upper pitches may stay greasy
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
06:00 1° dry 35 47 99.04%
09:00 1° dry 39 54 97.55%
12:00 2° dry 37 52 94.08%
15:00 2° dry 33 49 92.24%
18:00 2° dry 35 49 94.74%
21:00 1° dry 37 51 94.88%
Wed Wednesday 4 November
Poor
Temp2°C
Raindry
Wind42 km/h
Gusts64 km/h
Humidity88%
Should be dryWind 42 km/h, gusts 64 km/h — too windyHumidity 88% — potential fog
  • Cold mountain conditions — pack warm belay layers
  • Damp mountain air — upper pitches may stay greasy
  • Very windy — consider sheltered alternatives
Time °C Rain Wind (km/h) Gust Hum
06:00 0° dry 41 57 96.15%
09:00 1° dry 44 62 94.58%
12:00 1° dry 42 64 88.68%
15:00 2° dry 41 61 87.41%
18:00 2° dry 45 64 87.68%
21:00 1° dry 50 70 90.04%
Thu Thursday 5 November
Poor
Temp1°C
Raindry
Wind41 km/h
Gusts65 km/h
Humidity86%
Should be dryWind 41 km/h, gusts 65 km/h — too windyHumidity 86% — potential fog
  • Cold mountain conditions — pack warm belay layers
  • Damp mountain air — upper pitches may stay greasy
  • Very windy — consider sheltered alternatives
Time °C Rain Wind (km/h) Gust Hum
06:00 0° dry 45 62 94.57%
09:00 0° dry 48 66 92.49%
12:00 1° dry 43 65 85.79%
15:00 2° dry 40 58 86.14%
18:00 1° dry 42 58 90.55%
21:00 1° dry 42 57 92.36%
Fri Friday 6 November
Caution
Temp1°C
Raindry
Wind28 km/h
Gusts45 km/h
Humidity88%
Should be dryWindy — 28 km/h, gusts 45 km/hHumidity 88% — potential fog
  • Cold mountain conditions — pack warm belay layers
  • Damp mountain air — upper pitches may stay greasy
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
06:00 0° dry 35 47 95.46%
09:00 0° dry 35 49 92.71%
12:00 1° dry 29 45 87.76%
15:00 1° dry 26 38 88.73%
18:00 1° dry 26 34 94.16%
21:00 0° dry 24 31 96.03%
Sat Saturday 7 November
Caution
Temp1°C
Raindry
Wind18 km/h
Gusts29 km/h
Humidity89%
Should be dryHumidity 89% — potential fog
  • Cold mountain conditions — pack warm belay layers
  • Damp mountain air — upper pitches may stay greasy
Time °C Rain Wind (km/h) Gust Hum
06:00 -1° dry 19 25 97.5%
09:00 0° dry 20 28 94.94%
12:00 1° dry 18 29 89.49%
15:00 1° dry 17 26 89.49%
18:00 1° dry 19 24 96.64%
21:00 0° dry 20 26 97.31%
Sun Sunday 8 November
Caution
Temp-1°C
Raindry
Wind25 km/h
Gusts—
Humidity—
Should be dryWindy — 25 km/h, gusts null km/h
  • Cold mountain conditions — pack warm belay layers
  • Breezy — helps drying
Time °C Rain Wind (km/h) Gust Hum
06:00 -1° dry 23 29 97.21%
09:00 0° dry 25 33 94.61%

About Llech Ddu (Black Slab)

A magnificent crag of great character with complex rock architecture at the head of Cwm Llafar in the Carneddau, sitting between (and distinct from) Ysgolion Duon (the Black Ladders). Multi-pitch trad routes up to 140m; the structure is difficult to comprehend at first acquaintance and old in-situ pegs are typically rusted to crumbly rubbish. Hour-and-a-half approach up Cwm Llafar from Bethesda.

Region
Snowdonia — Carneddau
Rock type
Rhyolite
Aspect
north-facing
Altitude
600m
Exposure
high
Seepage
high

Other crags in this region

Craig yr YsfaYsgolion Duon (Black Ladders)