Snowdonia National Park
Includes all summits in the the northern half of Wales from Plynlimon northwards.
Viewing Forecast For
Snowdonia National Park
Sunday 24th January 2021
Last updated
Saturday 23rd January 2021 at
2:19 PM
Summary for all mountain areas
Scotland: Scattering of snow showers in the west, mainly coastal hills, but for most areas dry, cold and mostly sunny. Towards dusk, risk of zone of more persistent snow moving inland from west coast. England and Wales: Areas of snow across Wales will gradually ease away in afternoon. Mostly fine elsewhere with little wind.
Headline for Snowdonia National Park
Varied conditions. Clusters of snow showers. Hill fog extensive in snow.
How windy? (On the summits)
Direction will vary, mostly easterly in morning then northwesterly in afternoon, occasional lulls, but 15 to 25mph for several hours, risk 35mph high tops.
Effect of the wind on you?
Sometimes small, but beware of deteriorating conditions and significant wind chill at times.
How Wet?
Risk periods of snow and hail
Clusters of snow showers drifting across areas. In some areas may merge into a zone of constant snow for a few hours, whilst other areas see very little. Risk isolated thunder. Snow showers tending to ease through the afternoon.
Cloud on the hills?
Extensive around precipitation
Cloud varied - sometimes only fragments on higher slopes, with good breaks. Around precipitation, forming extensively and quickly below 700m.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Intermittent sun and very clear air. Visibility abruptly appalling if in snow.
How Cold? (at 900m)
-5C
Freezing Level
Terrain widely frozen. May rise above zero up to 300-400m for a time.
Viewing Forecast For
Snowdonia National Park
Monday 25th January 2021
Last updated
Saturday 23rd January 2021 at
2:19 PM
How windy? (On the summits)
Northwesterly, 20 to 25mph, perhaps up to 30mph.
Effect of the wind on you?
Blustery at times, and marked wind chill in exposure on higher terrain.
How Wet?
Occasional snow or hail
A few flurries or brief showers of snow or briefly hail, mostly hills near coast.
Cloud on the hills?
Patches some tops
Cloud banks covering some higher slopes for several hours, most likely toward west, but breaks likely to occur. Some hills may be often clear.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Occasional sun. Very clear air. Local low level fog patches in morning.
How Cold? (at 900m)
-4C
Freezing Level
As high as 400-500m near Irish Sea, otherwise terrain staying at least part-frozen into valleys following a frost.
Viewing Forecast For
Snowdonia National Park
Tuesday 26th January 2021
Last updated
Saturday 23rd January 2021 at
2:19 PM
How windy? (On the summits)
Northwesterly 10-15mph, backing through day to southwesterly, later 15-25mph.
Effect of the wind on you?
Mostly small, but marked wind chill later in the day.
How Wet?
Rain, preceded by snow, in afternoon.
After a dry morning, rain and snow will move in from the west in the afternoon. Snow initially falling to 400-500m, but will increasingly revert to rain at all levels.
Cloud on the hills?
Increasingly extensive
Banks of cloud covering higher slopes in morning, but some breaks; especially in the east. Then becoming extensive in afternoon down to lower slopes.
Chance of cloud free summits?
40% lowering to 10% in afternoon.
Sunshine and air clarity?
Patchy sun at first, but soon overcast. Visibility very good at first, but becoming poor or very poor in precipitation.
How Cold? (at 900m)
-2C, rising to 2C by end of afternoon.
Freezing Level
Much of the terrain frozen into the valleys from dawn following a widespread frost. However, milder air arriving in afternoon.
Planning Outlook
Staying cold into early next week. Mountain terrain widely frozen with snow cover. Overnight frosts into valleys, most significant into Highland glens. Fronts will encroach from the southwest by Tuesday, bringing potentially extensive snowfalls. Temperatures then tending to rise midweek, resulting in freeze and thaw cycles - thawing most marked in Wales, perhaps also northern England, but likely short-lived thawing on the Munros. Wind varied, occasionally up to gale force.