© North News & Pictures Ltd.A shepherd looking for his flock wades through deep snow on Commondale Moor in North Yorkshire as freezing temperatures grip Britain
Northern Ireland reached a new low of -8.6C (17F) at Aldergrove, in Belfast, and in Wales, a record minimum of -18C was recorded at Llysdinam.
Heavy snow is still falling in much of Scotland and north-east England, bringing travel disruption, and is set to last until Tuesday.
Forecasters says Siberian winds from Monday will make it feel even colder.
Met Office severe weather warnings for heavy snow and widespread ice remain in place for eastern Scotland, and north east England, down to Yorkshire and Humber.
Although there will be some sunshine in many parts of the UK, including East Anglia and North Wales later on Sunday, Northumberland, Durham, Nottingham and the Chilterns are set to get further snow showers.
There could also be flurries of snow on Sunday in Northern Ireland, north Norfolk and the southern-most counties of England.
© Press AssociationResidents walked along Tynemouth beach in North Shields as more snow fell overnight
That follows up to 40cm (16in) in parts of north-east England and Scotland on Saturday - said to be the most widespread snow at this time of year since 1993.
The coldest place in Scotland overnight on Saturday was Loch Glascarnoch, in the Highlands, at -15.3C (4F).
In England, Shawbury, near Shrewsbury in Shropshire, recorded -12.5C (10F) - the lowest November temperature since 1946.
Drivers are being urged to take care in the worst-hit areas and to travel only if necessary. The M9 in Stirling and the A1(M) in County Durham are particularly hazardous.
Norwich, Inverness, Newcastle, Luton and Durham-Tees Valley airports all experienced disruption to flights on Saturday, with problems continuing at Newcastle on Sunday.
© Bournemouth News & Picture ServiceA New Age: Teenagers enjoy a snowball fight as far south as Milton Abbass in Dorset which was blanketed in heavy snow
Several weekend race meetings were called off, as are Monday's events at Ffos Las, in Carmarthenshire.
Scotland's Alba Cup final, Dundee United's Premier League game against Rangers, and several FA Cup second round fixtures were also called off.
Newcastle United drafted in extra staff to clear their pitch ahead of Sunday's clash with Chelsea. The club says the game will go ahead unless there is significant further snowfall during the morning.
A spokesman for Northumbria Police warned: "Anyone going outside should consider whether their journey is critical and if they must venture out should dress appropriately."
Motoring organisation the AA said it had dealt with 10,400 breakdowns by Saturday afternoon and expected 15,000 by the end of the day - 80% higher than a normal November Saturday.
A man died after jumping into the icy River Lune in Halton in Lancashire on Saturday in an attempt to save his pet springer spaniel.
© Press AssociationPowder: A train throws up clouds of snow as it speeds through the icy conditions on the mainline near York this morning
"In England, Shawbury, near Shrewsbury in Shropshire, recorded -12.5C (10F) - the lowest November temperature since 1946"
If this is a consequence of manmade global warming, I'd hate to see what global cooling looks like.