The lowest temperatures of 2014 for England, Wales and Northern Ireland were recorded overnight.
Katesbridge, County Down, hit -8.8C (16.2F). Benson, Oxon, fell to -7.6C with -6.7C at Pembrey Sands, Dyfed.
Latest figures show the UK's coldest temperature of the year so far was -9C in Cromdale, Moray, on Saturday.
Meanwhile a Met Office cold weather alert for northern England and the Midlands has warned of health risks for vulnerable people.
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