Snow, ice and freezing fog that is sweeping across parts of the UK will continue for days, forecasters said.
The conditions have caused travel disruption, with delayed trains, motorway accidents and flights from Heathrow cancelled on Sunday morning.
A number of people are in critical condition after being pulled from a lake amid freezing temperatures in Solihull, according to police.
Temperatures could drop as low as -15C (5F) in northeast Scotland overnight. If so, it would be the lowest temperature the UK has seen since February last year.
Earlier, the Met Office warned power cuts and mobile phone coverage might also be affected.
Snow has been settling in Devon and Wales as well as parts of Scotland and areas of north-west England.
A yellow weather warning for snow and ice is in place for Scotland, London and south-west England until Monday morning.
But the Met Office ended its weather warning for Northern Ireland, despite the cold weather leading to some sporting fixtures being cancelled.
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