Temperatures are set to plummet to -10C tonight as the start of December brings a winter freeze.
Bookies have also slashed the odds on it being the coldest ever December in the UK.
Frost and ice will blanket parts of the UK with it dropping to -10C in rural Scotland, including -6C in Tyndrum.
Elsewhere, in Newcastle it is set to be 0C overnight and -1.6C in the Cotswold town of Winchcombe.
Brits are being warned of potential icy roads and travel disruption in the morning.
BBC meteorologist Louise Lear said: “There was a hard frost overnight, with temperatures in rural Scotland down to -10C.
“Over the next week, it stays cold but largely dry and sunny.
"Down in the south-east, there is a small weather front that is clipping Cornwall that is preventing temperatures falling too low, with a maximum of around 11C.
“That weather front that swept through Cornwall will eventually bring some heavy snow to the Alps on Sunday."
Louise added that the first week of December could see temperatures “fall away sharply”.
She continued: “In the UK we start Sunday with high-pressure coming in from the West.
“Temperatures are likely to struggle tomorrow, just below where they should be for this time of year.
“The temperatures will be up to 3C at the very best in some areas, with others reaching at most 8C."
The dramatic weather conditions across Europe has even seen parts of Sweden plunge to almost -30C.
The Met Office has already warned that “flight cancellations are possible”.
Earlier today, the Met office issued a yellow weather warning for fog, covering the Midlands and South Yorkshire.
The warning was enforced for 10 hours.
Meanwhile, leading bookmaker Coral make it odds-on at 4-6 for next month being the coldest December on record in the UK.
The firm go 4-5 for a White Christmas anywhere in the UK this year and evens for this winter to be the coldest ever.
"It's going to be a frosty start to the new month and with temperatures dropping fast, the odds have been cut on it being the coldest ever December in the UK," said Coral's John Hill.
"Snow is set to fall over the next few weeks in many parts of the UK, therefore, we now make a White Christmas more than likely this year," added Hill.
Weather forecast:
Tonight:
Rain clearing the far southwest. Elsewhere, mainly dry with clear periods allowing another cold, frosty night. A risk of fog patches across northern areas.
Sunday:
Most places dry and sunny, but feeling rather cold. A few showers likely in far north and also across the southeast.
Outlook for Monday to Wednesday:
Mainly cold and dry with light winds, overnight frosts, and increasing amounts of mist and fog in the south. Scotland breezier, less cold, and often cloudier with outbreaks of rain.
