Temperatures may plummet as low as -8°C for parts of the country next week after a mild weekend, the Met Office has said.
Some regions will be hit by wet and windy weather on Sunday, with the Met Office forecasting as high as 15°C in south-east England and 16°C in south-west England.
Clear spells and scattered showers are expected on Sunday evening, before a band of persistent rain arrives from the west.
Cloud and rain will spread south-eastwards throughout Monday, followed by sunnier but much colder conditions, forecasters have said.
Temperatures will then plunge into Monday evening, dropping as low as -8°C in parts of rural Scotland. The Met Office also forecast scattered and “wintry” showers in the north of England.
“The drop in temperatures is likely to spread south on Monday,” Met Office senior operational meteorologist Dan Stroud told i.
“It will be a rather cloudy day, with a band of showers sinking south. It will be turning colder and brighter behind that band as the rain clears.
“Temperatures are likely to drop in the wake of that frontal system. Across Aberdeenshire, down to Edinburgh, north-east England and north Yorkshire, it’s going to be quite breezy with colder conditions.
“On Monday night, with clearing skies, we are likely to see widespread frost develop, with a few icy patches. We are looking at temperatures as low as -8°C in rural parts of Scotland.
“Even in the south, we are looking at temperatures cold enough for widespread frost.”
Stroud added that Tuesday “will have a cold start but will be a dry and bright day for many of us.
“It will cloud over from the west during the afternoon, with outbreaks of rain pushing eastwards overnight Tuesday into Wednesday. That cloud and rain moving eastwards marks a rise in temperatures,” he said.
The news of a cold snap comes after hundreds of flood warnings were issued across England and Wales, as well as a “danger to life” warning in Northamptonshire, as Storm Conall and Storm Bert battered Britain.
Hundreds of homes, businesses and roads were flooded as a result of the storms, while winds of more than 80mph were recorded across parts of the country.
The Environment Agency issued a “danger to life” warning at the Billing Aquadrome caravan site in Northamptonshire, where about 1,000 people were evacuated, according to West Northamptonshire Council leader Adam Brown.
Nine people refused to leave their homes after severe flooding in the area prompted evacuation for the fourth time this year, he said.
At least five people died during Storm Bert, which brought more than 80 per cent of November’s average monthly rainfall in just 48 hours.
Brian Perry, 75, went missing in floodwater near the River Conwy near Trefriw, Conwy county during Storm Bert and was also found dead a day later.
Meanwhile, a man in his sixties died after a tree fell on a car on the A34 near Winchester, Hampshire, police said.
A man in his eighties died in hospital after he was rescued from a car that had driven into a body of water. Two other fatal collisions happened in England during the storm, killing one man in his forties and another aged 34.
As flood-hit communities begin mass clean-ups, questions are being asked about how prepared the UK was for last week’s floods.
Many have criticised the Met Office for only issuing a yellow weather warning ahead of the floods, while some said they did not receive flood alerts until water was a foot deep in the streets.
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