Temperature dips to -13C on coldest day of winter
Temperatures in the Highlands have fallen to as low as -13C during what forecasters say has been the coldest day of the winter so far.
Met Office yellow be aware warnings of snow and icy conditions were in place for large swathes of Scotland.
Temperatures fell to -13.7C in Loch Glascarnoch.
Motorists were urged to take care, with freezing temperatures and icy conditions in many areas.
BBC Weather said it was -8C in Katesbridge, at County Down, -7C in Dalwhinnie, while -6C had been recorded at Sennybridge, Powys.
Temperatures of -3C have been recorded in Glasgow, Edinburgh, Manchester, Enniskillen and Exeter, with Cardiff and Birmingham reaching -2C.
Only parts of East Anglia and south-east England have avoided a frost so far because of cloud cover although Cambridge and Frittenden in Kent both saw temperatures of -2C.
The lowest January temperature recorded in the UK is -27.2C in Braemar in 1982.
Snowfalls and ice caused some problems on the roads in Scotland on Friday and Saturday.
BBC Scotland weather presenter Judith Ralston said "a widespread sharp frost, with an ice risk on untreated surfaces" was expected during the night.
She said temperatures were due to be typically down to -5C or -6C in towns and cities, but could fall as low as -8C to -10C where snow continued to lie, possibly reaching -12C in some parts.
Road maintenance operator Bear Scotland said all trunk roads in the north west of Scotland had received double salt treatments, and 41 spreaders were patrolling routes and treating as necessary on Monday morning.
A spokesman urged motorists to "drive to the conditions".
The A9 at Dalnaspidal fully reopened at 05:20 in both directions following earlier issues with a jack-knifed lorry.
But the A93 was closed between Braemar and Spittal of Glenshee due to snow, and the A939 was also closed between Tomintoul and Cockbridge.
Scotland Transerv, which is responsible for maintaining roads in the south west, said it had 22 gritters and almost 350 tonnes of salt ready to head out on the roads on Sunday evening.
Amey said 12 patrol gritters and 16 frontline vehicles would be covering roads in the south east of the country overnight into Monday morning.
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