Tuesday 28 Dec - Thursday 6 Jan
This period remains somewhat uncertain in detail, but generally sees a split between colder air to the north and milder air to the south. Looking to remain unsettled with further spells of rain for most at first. To the south, mild, unsettled weather, with rain and occasional strong winds. To the north, more settled conditions with brighter spells and winds slowly easing to lead to perhaps some frost or ice. Becoming very mild across all areas in time. Along the boundary, potential for significant weather with snow likely at times, in addition to the associated wintry hazards. Becoming colder than average heading into January with any unsettled, milder spells most likely for the west and south.
Friday 7 Jan - Friday 21 Jan
Likely to remain colder than average heading into this period, alongside a largely settled pattern initially. Any unsettled, milder spells are most likely to be confined to west and southwestern regions, where longer spells of rain, and perhaps areas of snow, are possible with occasional strong winds. There is an increased likelihood of winds from a southeasterly direction, bringing colder than average temperatures more widely and risk of some wintry showers into eastern areas, with associated wintry hazards. Overall, the likely colder than normal start, becomes replaced by milder conditions from mid to late January.
https://www.metoffice.gov.uk/
Originally Posted by: Gavin D