Christmas Day will start foggy, and frosty, for many areas.
The often dense and sometimes freezing fog will be slow to clear in places, with only brief brighter spells developing.
Some areas will remain dull and chilly all day.
The maximum temperature could reach 8 °C.
Tonight will be milder than last night, due to large amounts of low cloud, along with mist and hill fog, and only limited clear intervals.
The temperature could dip to as low as 6 °C.