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

Met Office Forecast

Wales

Chilly, cloudy with outbreaks of rain.

This Evening and Tonight:

It will be a cloudy evening with outbreaks of rain. It will become dry for some overnight, however there will be lingering showery rain. It will also be windy, with potential severe gales along the coasts. A patchy frost. Minimum Temperature 1C.

Friday:

Windy with sunny spells and showery rain at first, the rain will become increasingly confined to northern areas into the afternoon. Feeling chilly in the wind. Maximum Temperature 9C.

Outlook for Saturday to Monday:

Remaining unsettled and rather cold through the weekend. It will often be windy with further rain or showers bringing a little snow, mainly on hills. Drier and brighter on Monday.

Day 6-7 and Week 2:

A less windy interlude is likely for many at the start of next week with longer drier, brighter spells but also night frost and patchy fog. However, there may be further rain in the southeast on Tuesday, perhaps extending further north. From mid-week it will turn milder and unsettled again as further bands of rain and strong winds edge in from the west, after which unsettled and sometimes windy conditions will probably last for the rest of the period. Most of the rain will probably be in the west with drier spells more likely in the east and southeast. Snow may occur at times in the north, mainly on high ground. There remains a chance of brief drier, colder interludes, with an increased risk of frost and fog.

Week 3 and 4:

Confidence is low throughout this period. Changeable and sometimes windy conditions seem more likely through late December, with the wetter weather in the west and longer drier spells in the east. By the time we go into January, longer spells of more widely dry, quiet and bright weather are possible, especially for southern and central areas, with the northwest more likely to remain unsettled. Temperatures should be near to or somewhat above average overall, but with the usual day to day variations. However in quieter spells, it is likely to be colder generally, with an increased risk of frost and fog.

Met Office : Wales : 2019-12-12T14:55:02

Daylight : Brecon Beacons NP

Data: US Navy Observatory

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, and, (ii) if there are hills on the horizon.
• Of course, you need a cloudless night as well!
• Data: US Navy Observatory

Met Office Mountain Forecast

Issued: 1800 on 2019-12-12 for Brecon Beacons

Data: Met Office