The Met Office has said that UK is "over the worst" of the cold snap, with some temperatures in the UK hitting 14°C in some parts of the UK, compared to being more like -4°C over the past week. Wales has been hit by a wave of weather warnings for snow and ice, but it is set to change next week.
Temperatures dropped to -8.5°C in Sennybridge, Powys, in the early hours of Saturday morning, but temperatures will rise in Wales to 7°C on Sunday, and continue to climb over the coming week.
The Met Office said, however, parts of England will be hit by difficult driving conditions while freezing temperatures could see untreated surfaces become slippery.
The yellow weather warning will be in place between 2am and 11am on Monday and covers areas in the south and east of the country, with Yorkshire down to East Anglia expected to see the densest fog. It means travel delays are likely and flights could be cancelled.
But Met Office meteorologist Craig Snell said the worst of the cold spell is over, with temperatures expected to climb next week across the whole of the UK.
Mr Snell said: "Next week, looking at the severe front, it's looking pretty benign. We're starting to lose the risk of fog and temperatures are generally around where they should be.
"We'll probably lose the really hard frosts. In terms of ice and snow, it certainly looks like we're over the worst.
"We've got to keep an eye on risk of fog generally this cold spell, although the main hazards from it look like they are beginning to diminish."
Overnight temperatures across the country are still forecast to be sub-zero during the weekend, and will climb to highs of around 5°C in the South East and 10°C in the North.
The Met Office forecast for Wales from Monday to Wednesday says: "Mostly dry with brighter periods on Monday, then cloudier with rain and drizzle in places on Tuesday and Wednesday. Rather chilly with overnight frosts at first, slowly turning milder later."
Mr Snell explained the temperatures would be lower in the South - which is often warmer than other areas of the country - because of a change in wind direction in the north west of the UK.
The change will see an Arctic blast that swept across the UK over the past five days giving way to warmer air from the Atlantic, but will take longer to reach southern areas.
It comes after temperatures plunged below -10°C in parts of the UK this week amid snow and icy conditions, but BBC weatherman Matt Taylor said that temperatures of 14°C are possible in north east Scotland on Tuesday.
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