Compare all 15 summits over 3,000 feet in Eryri before committing to this long and serious mountain challenge.
Every summit is shown side by side. The combined grade gives extra weight to the weakest forecast.
A grey, cloudy day on Snowdon - Yr Wyddfa: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (fresh and blowy).
A mixed day on Crib y Ddysgl: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (fresh and blowy).
A mixed day on Crib Goch: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (fresh and blowy).
A mixed day on Elidir Fawr: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (fresh and blowy).
A mixed day on Y Garn: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (fresh and blowy).
A mixed day on Glyder Fawr: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (fresh and blowy).
A mixed day on Glyder Fach: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (fresh and blowy).
A mixed day on Tryfan: summit wind broadly 10-30 mph, with gusts 25-35 mph early in the morning (strong winds).
A mixed day on Pen yr Ole Wen: summit wind broadly 10-30 mph, with gusts 25-35 mph early in the morning (strong winds).
A mixed day on Carnedd Dafydd: summit wind broadly 10-30 mph, with gusts 25-35 mph early in the morning (strong winds).
A mixed day on Carnedd Llewelyn: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (strong winds).
A mixed day on Yr Elen: summit wind broadly 10-30 mph, with gusts 25-35 mph early in the morning (strong winds).
A mixed day on Foel Grach: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (strong winds).
A mixed day on Garnedd Uchaf: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (fresh and blowy).
A mixed day on Foel-fras: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (strong winds).
Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.
The Welsh 3000s crosses the Yr Wyddfa, Glyderau and Carneddau ranges, taking in 15 summits above 3,000 feet. Its length, exposed scrambling and repeated high ground make a single valley forecast inadequate for choosing a day.
The combined grade is deliberately conservative and gives extra weight to the weakest summit. Review every row, especially Crib Goch and Tryfan, and use the full peak pages for timing and hazard detail.
Read BMC Welsh 3000s guideBalance the historical rain-and-wind pattern with daylight, snow and the demands of the route. This is seasonal context, not a forecast for your chosen date.
These months have the highest average share of settled rain-and-wind days across the challenge's represented areas within our May-to-September planning comparison. Small percentage differences are not a reliable reason to choose one week over another.
The Welsh 3000s combines a long day with exposed scrambling. A settled rain-and-wind month does not tell you whether Crib Goch or Tryfan will be dry, clear or free of ice on your chosen day. BMC route context.
Green bars mark May to September. Percentages measure rain and gusts only, not sunshine, cloud-free summits, snow conditions or safety.
48% settled rain/wind in this area's strongest May-to-September months.
Sample: Snowdon / Yr Wyddfa, 1,085 m.
Snowdon - Yr Wyddfa, Crib y Ddysgl (Garnedd Ugain), Crib Goch, Elidir Fawr, Y Garn, Glyder Fawr, Glyder Fach, Tryfan, Pen yr Ole Wen, Carnedd Dafydd, Carnedd Llewelyn, Yr Elen, Foel Grach, Carnedd Gwenllian (Garnedd Uchaf), Foel-fras. Shared regional context does not imply identical summit conditions.
Based on our ERA5-derived regional mountain climate summaries, 1986 to 2025. Each distinct area counts once, so several peaks sharing a sample do not multiply its influence. These monthly summaries do not measure how often all summits were settled on the same day. Explore the mountain climate guide.
Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.