Brits now face an arctic snow bomb after 'one of the coldest nights so far' this winter, the Met Office forecast predicts.
Icy temperatures and heavy snowfall are set to follow the chaotic Storm Christoph which flooded hundreds of homes earlier this week.
Freezing -7C blizzards are set to hit many areas of the UK as a blast of Arctic air sweeps across the nation.
The wintry snow and ice will cause widespread travel disruption in the worst affected areas.
There are four yellow weather warnings in place for either snow or snow and ice, issued by the Met Office.
Temperatures are expected to plunge to -7C in northern England and -10C in Scotland.
A band of rain will cross the south west of the country and turn to snow as it moves eastwards, the Met Office said.
Up to two inches of snow could settle, but areas above 300ft could see as much as 10 inches.
Temperatures across the entire UK dropped below freezing last night, with the weather agency saying it was 'one of the coldest' we've seen this winter so far.
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London and Manchester saw a freezing -3C overnight, and Britsol, Glasgow and Belfast endured -2C.
The coldest temperatures were in the Scottish Highlands with a freezing -10C.
Frosts are expected overnight on Sunday, Monday and Tuesday.
Martin Bowles, meteorologist at the Met Office, said: "The biggest hazard over the next couple of days is going to be ice because we're getting these snow showers which will all freeze overnight.
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"Obviously roads tend to be quite well gritted, especially main roads, but I would warn people to be careful on pavements, minor roads that don't get gritted or city roads."
He said the cold spell would continue until the middle of next week before being replaced with milder temperatures for the final days of January.
Despite people being urged to heed flood warnings into the weekend, Mr Bowles said they were 'gradually reducing' and more heavy rain was not expected until Wednesday night or Thursday.
"We're hopeful that the river levels will fall quite significantly before that so we're not expecting any significant flooding problems over the next few days, apart from in areas where the warnings are already in place," he added.
The Environment Agency previously warned of 'exceptionally high river levels' following days of heavy rainfall in the wake of Storm Christoph, with hundreds of properties across the country flooded.
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