A dusting of white frost has covered fields, trees and rooftops after sub-zero temperatures overnight prolonged the cold snap across Britain.
The mercury plummeted to -10.5C in the Scottish town of Aboyne, while Chesham in Buckinghamshire was not far behind, with temperatures of -9C.
In the village of South Newington in Oxfordshire they fell to -8C.
The chilly weather, brought on by a period of high pressure, followed a mild start to the winter but forecasters predicted the biting cold would not last.
MeteoGroup, the weather division of the Press Association, said the last few days had seen one of the first periods of high pressure this season.
Weather forecaster Brendan Jones said: "High pressure tends to bring settled, sunny weather but during winter it brings clear skies at night and that allows any heat that was absorbed by the ground, the trees and the buildings during the day time to escape out into space.
"Everything cools down - the ground cools down and the air cools down."
Monday night is set to be the last of the current run of very cold nights, he said, with Tuesday and Wednesday expected to be somewhat milder.
The frost could return towards the end of the week however, with snow around Scotland a possibility, he added.
