Heavy snow has blanketed the east and south-east of England, with forecasters warning of further showers overnight.
The Met Office said it was “bitterly cold” due to strong easterly winds and temperatures in parts of the UK would continue to remain around freezing.
An amber warning – meaning travel disruption and power cuts are likely – is in force until midday on Monday.
And less severe yellow warnings have been issued for much of England, Scotland and Northern Ireland.
Some 14cm (5.5in) of snow was recorded at Manston, Kent, on Sunday evening, BBC Weather forecasters said.
They added that further snowfall in some eastern parts of the country could bring up to 15cm of snow on Monday, with a few lighter flurries elsewhere in the UK.