Wednesday 4 Dec - Friday 13 Dec
Much of England and Wales settled at first with areas of fog developing which will locally persist for much of the day on Wednesday and Thursday. Some bright or sunny spells are possible, particularly around coasts. Further northwest, increasingly unsettled conditions are expected to develop during Wednesday with wet and windy weather transferring slowly southeast through Thursday and Friday. Over the weekend and into the following week, the changeable theme is likely to persist with spells of more organised cloud, rain and stronger winds followed by some brighter, showery and colder interludes. The heaviest rainfall is likely across the northwest with snow over northern hills, possibly to lower levels at times. Temperatures are likely to remain at or slightly below normal with occasional milder interludes mainly in the south.
Friday 13 Dec - Friday 27 Dec
Although confidence is low for this period, the unsettled conditions are expected to continue, bringing some rain with interludes of cold but bright weather alongside a risk of showers. There is a continued chance of further wintry showers on high ground in the north. Temperatures will likely tend towards average, or just above, for this time of year. Towards the end of 2019 there is a possibility that we will see a transition to some longer, more settled and colder periods.
https://www.metoffice.gov.uk/