Castell Henllys (Pembrokeshire) weather

Headline:

Very cold and icy with further snow showers in places.

This Evening and Tonight:

A mixture of clear periods and scattered wintry showers this evening and overnight, these leaving a fresh covering of snow in places with the risk of icy stretches in many areas. Skies clearing later and turning very cold and frosty. Minimum temperature -8 °C.

Monday:

Remaining similar with scattered snow flurries, these primarily in western areas. Sunny intervals too, these most prolonged in eastern counties. Staying very cold with icy stretches persisting in places. Maximum temperature 4 °C.

Outlook for Tuesday to Thursday:

Turning cloudier on Tuesday with patchy rain and hill snow possible. Brighter at first on Wednesday, then wet overnight with further rain and hill snow arriving Thursday. Somewhat less cold.

A changeable period is expected, with Atlantic frontal systems occasionally affecting the UK, bringing spells of rain, likely preceded by snow in some areas, more especially central, northern and eastern parts. Some significant snowfall is possible in places, particularly on northern hills. These low pressure systems could also bring some strong winds. These will be interspersed with quieter, drier interludes under transient ridges of high pressure, with the potential for frost, and wintry showers along coasts exposed to northerly winds. Temperatures will tend to trend closer to average as the period progresses, mainly in the south, such that the frequency of wintry hazards, especially in the south, may reduce slightly. However, there is a hint late in this period that it may briefly turn widely drier and colder again.

The outlook through the latter part of January and into the start of February is very uncertain, with no strong indication for any particular weather pattern to dominate. However, a broadly westerly regime seems more likely than not. As such, conditions are most likely to be changeable. Spells of wet, windy and mild weather are likely at times, along with some colder, drier interludes with overnight frost and fog. There is a hint that this period may start off largely dry and cold though. Snow and ice remain possible, especially in central and northern parts of the UK, but the chance of these is generally lower than earlier in January.