Llansadwrn (Anglesey) Weather:
Eryri (Snowdonia) Snowline Report

Eryri (Snowdonia) Mountains Winter Season 2025/26

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Rapidly thawing snow was lying around the summits on the 1st leaving a few areas of snow, cornices on cliffs and small patches patches on the 2nd. On the 5th fresh snow had fallen again around the summits before quickly thawing with a little more seen on the 11th. One or two small patches had survived on Garnedd Ugain on the 12th. Thereafter there was no significant snow, but the air around the highest summits of the Carneddau and Yr Wyddfa from the 25th was very cold resulting in deposition of frost and rime enough to be seen from Llansadwrn. There was a sprinkling of fresh snow on the 30th .

January 2026

Light snow fell on the mountains on the 1st and on the 2nd further moderate to heavy snow in showers had fallen and was lying as low as 350 ft at 0900 GMT. More snow showers on the 3rd and 4th led to moderate accumulations on high ground mainly in the west and on Anglesey. On the 5th snow had fallen at sea level again mainly in the west and on Anglesey resulting in further accumulations at higher levels. On the 6th with temperatures rising there was sleet and light rain from noon at lower levels and more snow at higher levels led to further accumulations. Little change in levels on the 7th with a little thawing taking place at low levels Snow was becoming unstable in some areas at higher levels with cornices in places. On the 8th snow was still lying above 2000 ft with 30% cover at 1750 ft with remnants at 1250 ft on the lower slopes of the Carneddau and at 300 ft on Anglesey. Llanberis Mountain Rescue Team warned of possible localised avalanches on Yr Wyddfa. Snow remained and on the 10th it was lying at 2000 ft with some still at 500 ft. Temperatures rose above freezing on the summits on the 11th and there was rain, but there was lying snow at 1250 ft with remnants at 1000 ft. On the 12th areas of snow remained with patches as low as 1250 ft. The 13th continued mild with areas of snow around the summits above 2650 ft. Patches remained on the 14th with some cornices on cliffs and areas of snow in places mainly above 2750 ft. On the 23rd there was a covering of wet snow above 2800 ft with a little at 2625 ft. The weather on the 24th turned a little colder and more snow fell on the 27th above 2500 ft and 30th lying above 1250 ft.

February

There was snow on the mountains at the beginning of the month in the form of snow patches and cornices and areas lying around summits. On the 3rd snow fell at 800 ft and was lying above 1250 ft and drifting in the strong E'ly winds. On the 4th there was snow as low as 1250 ft and lying snow at 2250 ft on the Carneddau covering older areas of snow. More snow fell overnight 5/6th and had settled at 2150 ft and was lying at 2750 ft on the morning of the 6th. On the 7th with lying snow remaining at 2950 ft frequent patches of snow and old drift lines persisted on the Carneddau as low as 2150 ft. Lying snow remained until the 9th and some areas and snow patches and icy remnants persisted in places on the Carneddau and Yr Wyddfa gradually thawing. On the 13th temperatures fell again after midnight ( c.-5C on summits) with snow falling at 1000 ft it was lying above 1250 ft on the Carneddau. Snow was lying at 2000 ft on the 14th with 30% cover at 1500 ft. Fresh snow fell on the 17th and was lying at 2650 ft on the Carneddau with a little as low as 1250 ft in places. On the 18th snow was lying at 2500 ft with snow patches persisting at 2250 ft on the slopes of Carnedd Llewelyn with remnants on Tryfan. More snow on the 19th left snow lying at 2000 ft with some as low as 1850 ft and on Tryfan at 1500 ft. Garnedd Ugain and Yr Wyddfa were well covered. The 20th saw a significant thaw, but snow remained above 2850 ft until the 21st when snow patches were present as low as 2750 ft these persisting until the end of the month.

March

Areas of snow above 2950 ft around summits and a few patches of snow were present at the beginning of the month, some at 2750 ft on the Carneddau. Fresh snow fell on the 3rd and was lying at 1250 ft with temperatures of c.-3C on the summits with a little drifting in strong E'ly winds. On the 4th snow was lying at 2250 ft with some as low as 1250 ft. Fresh snow fell again early on the 6th above 2150 ft leaving a light covering above 2750 ft particularly on the north facing slopes of the Carneddau, Garnedd Ugain and Yr Wyddfa. Cover of snow had disappeared by the 9th leaving snow patches as low as 2150 ft. Turning colder again after midnight on the 13th (c.-5C on summits) fresh snow fell and was lying at 1250 ft. On the 14th snow was lying above 2250 ft on the Carneddau with some at 1750 ft in the area of the Nant Ffrancon Pass. A scattering of fresh snow on the summits from showers in the early hours of the 16th with old snow patches surviving in places. A sprinkle of fresh snow on summits seen early on the 16th soon disappeared, but snow patches and cornices on cliffs and remnants remained in several places until the 23rd. As temperatures on the summits turned colder again (c.-3C) fresh snow fell on the 25th with a thin layer of snow lying at 2000 ft. on the Carneddau with some as low as 1250 ft near Ogwen. On the 26th the snowline on the Carneddau was at 2150 ft, but by the 27th had mostly melted leaving a few patches and cornices on cliff-tops with widely scattered pockets of remnants. Ice precipitation (ice pellets) fell widely in the afternoon. Snow patches and cornices on cliffs were present on the 28th in a few places.