November has so far been exceptionally mild with temperatures 3-6C above average.
But that has now changed as a northerly wind is dragging cold Arctic air across the UK with temperatures now falling 3-6C below the mid-November average.
Cold-health alerts are in force across the Midlands and northern England until 08:00 GMT Friday.
These alerts are mainly for health and social care services, warning of “significant” impacts to more vulnerable members of the community.
Extra services may be required to deal with the colder weather.
Rain is forecast to spread south and east across the UK on Monday night and Tuesday, with the air is cold enough for this to turn to snow for some.
A yellow weather warning for snow has been issued for northern and eastern Scotland starting at 03:00 GMT on Tuesday and valid until 18:00.
There could be as much as 5-10cm of snow accumulating over the highest ground (above 400m) but even down to lower levels 2-5cm is forecast.
The snow could make some higher routes impassable and there could be some disruption to rail journeys.
During Tuesday there could also be hill snow in the North Pennines and the North York Moors.
