Black Mountain (Fan Brycheiniog and Fan Foel) from Glyntawe walk

Met Office Forecast

Wales

Snow clearing to a clear and dry night. Icy.

Today:

This morning will see a band of snow, sometimes heavy, moving northeast across the country, trailed by scattered, possibly wintry, showers. Snow returning from the north this afternoon, though becoming lighter and more patchy. Cold with a risk of ice. Maximum Temperature 4C.

Tonight:

Last of the snow will clear south early this evening, leaving a cold but clear and dry night for most. Some cloud and scattered showers along coasts. Frosty and icy. Minimum Temperature -9C.

Monday:

A largely dry and sunny day, though the north may see the odd localised shower, and some cloud may develop inland during the afternoon. Maximum Temperature 6C.

Outlook for Tuesday to Thursday:

Tuesday starts largely dry, though a band of rain edging in from the southwest. Wednesday and Thursday cloudy with outbreaks of rain, possibly heavy, and strong winds.

Day 6-7 and Week 2:

Unsettled conditions look likely to dominate for this period, with low pressure across the UK. Therefore, this should, bring changeable weather to most of the country, with periods of rain, showers, and strong winds at times. While mild westerly and southwesterly winds are expected to be dominant for most of the period, occasional colder northerly winds are possible, bringing a chance of snowfall, likely confined to the far northern parts. Towards the end of the period, we may see high pressure bringing a higher than average chance of cold weather more widely with wintry outbreaks. However, there is a chance of drier than average conditions, which would bring an increased risk of frost and fog.

Week 3 and 4:

Confidence is low for this period, but current signals indicate a possible high pressure system around or near the UK during this period. This would likely bring cold northerly winds, producing colder than average temperatures and wintry outbreaks. The second half of February is likely to have a mixture of weather types, with periods of wet, windy and milder weather interspersed with drier, calmer, colder periods.

Met Office : Wales : 2021-01-24T02:57:05

Daylight : Brecon Beacons NP

Day length is dusk to dawn. Times will vary a little if there is a hill on the horizon.

It should still be light enough to read at dawn and dusk, so there will be enough light for walking even earlier (later).

Moonlight : Brecon Beacons NP

Notes

• The moon's phase or fracillum (percentage of the moon illuminated) doesn't vary much with location.
• A full moon is not just bigger, its much brighter. A half moon ('50%') give less than 5% of the illumination of a full moon. You can walk with a half moon if its high in the sky (after dusk for a growing moon, before dawn for a shrinking moon).
• Sky glow (light reflected by air or clouds) from nearby cities, and especially snow on the ground also effect light levels.
• Times will vary a few minutes, as (i) these figures are for the centre of the county the walk is in, (ii) if there are hills on the horizon, and (iii) if you are on a hill
• Of course, you need a cloudless night as well!

Met Office Mountain Forecast

Issued: 0600 on 2021-01-24 for Brecon Beacons

Data: Met Office