Snowdonia National Park
Includes all summits in the the northern half of Wales from Plynlimon northwards.
Viewing Forecast For
Snowdonia National Park
Wednesday 1st December 2021
Last updated
Tue 30th Nov 21 at
4:43PM
Summary for all mountain areas
Strong northwesterly winds will bring colder conditions to all areas once again with clusters of showers moving south across the country through the day, snow falling to lower slopes increasingly through the day but mainly higher slopes in Wales. Cloud frequently covering higher tops.
Headline for Snowdonia National Park
Much colder, very windy with frequent precipitation, snow higher slopes.
How windy? (On the summits)
Northwesterly, 30 to 50mph, suddenly gusty in showers. Strongest winds in the morning.
Effect of the wind on you?
Frequent significant buffeting to low elevations. Arduous conditions higher terrain, especially in the morning. Significant wind chill.
How Wet?
Frequent showers, snow tops.
Showery, or periods of near-constant precipitation coming in from the northwest. Fewer showers mid-Wales. Hail, or snow above about 600m. Chance isolated thunder.
Cloud on the hills?
Extensively covering tops
Cloud extensively covering higher tops, but cloud bases changing quickly in and out of showers. At times shafts of cloud below 600m, especially Snowdon Range.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Brief bursts of sun. Visibility sometimes very good, but suddenly appalling when in cloud and snow on tops.
How Cold? (at 900m)
0C lowering through day to -3C. Will feel closer to -15C or below in direct exposure to strongest winds.
Freezing Level
900m, tending to lower, by evening dropping below 600m.
Viewing Forecast For
Snowdonia National Park
Thursday 2nd December 2021
Last updated
Tue 30th Nov 21 at
4:43PM
How windy? (On the summits)
Northerly 25 to 35mph from dawn, risk locally 40mph tops, will ease to become northwesterly 10 to 20mph in afternoon.
Effect of the wind on you?
Be prepared for fairly arduous conditions for a few hours in the morning with significant wind chill, easing by afternoon.
How Wet?
Scattered snow showers, tending to fade.
Scattered of snow and hail showers will run in from the Irish Sea, these mainly in the morning before tending to fizzle out. Risk snow arriving from west in evening.
Cloud on the hills?
Early banks mostly clearing.
Banks will likely cover tops for a few hours in the morning, but into the afternoon bases will widely lift above tops. Becoming extensive from west in the evening.
Chance of cloud free summits?
30% lifting to 70%
Sunshine and air clarity?
Sunshine increasingly extensive toward mid Wales. High cloud building from west. Visibility excellent, but very poor in early snow showers.
How Cold? (at 900m)
-2 or -3C
Freezing Level
Terrain widely frozen after widespread frost at dawn.
Viewing Forecast For
Snowdonia National Park
Friday 3rd December 2021
Last updated
Tue 30th Nov 21 at
4:43PM
How windy? (On the summits)
West to southwesterly 15 to 25mph, risk of further increase to 30-35mph after dusk.
Effect of the wind on you?
Mostly small much of day, but at times fairly blustery tops with marked wind chill. May become fairly arduous in evening.
How Wet?
Early rain clearing. Then a few showers.
The legacy of a front, that will have given some transient summit snow overnight, will give a little rain at dawn before clearing. Then a few isolated showers.
Cloud on the hills?
Extensive, slowly lifting and breaking
Extensive low cloud much of the day, down to lowest slopes in morning, before tending to lift to higher slopes into the afternoon, but unlikely to clear tops.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Generally overcast, a little sun possible in east. Widely murky through morning, becoming good into afternoon.
How Cold? (at 900m)
2 or 3C
Freezing Level
Above the summits
Planning Outlook
North or northwesterly winds will dominate through the rest of the week - most mountains frequently sub-zero onward into the weekend, at times to lower slopes. Some variation of freezing level, mainly toward western coasts and brief tongues of less cold air may move across Wales, perhaps the south Pennines. Frequent precipitation, mostly snow on the mountains, sometimes heavy showers with hail. Winds varied, but often strong, gales or severe upland gales at times.