Drivers are encouraged to keep off the roads due to deadly black ice as officials warned people could injure themselves by "slipping and falling" on icy surfaces.
But towards the end of the week Brits could be looking at much warmer temperatures, with ice and snow no longer dominating the roads.
Last night was predicted to be the coldest night of winter in the UK with temperatures tipped to plunge to -16C.
However, temperatures dropped to -12.6C in Braemar, Aberdeenshire, falling just short of the -15.4C record.
But the record in England was smashed last night after temperatures plummeted to -11.7C in Chillingham Barns in Northumberland in the early hours of Sunday morning.
This resulted in the Met Office today issuing a fresh yellow warning for ice and snow across Scotland.
The Met Office warned: "Icy stretches will be the main hazard on Saturday evening, overnight and Sunday morning
"Snow and Ice will affect travel across parts of Scotland from Sunday evening into Monday."
WEATHER WARNINGS
In a chilling warning for motorists to stay off the roads, forecaster Simon Partridge told The Telegraph: "The main concern is black ice on the roadways, and we simply need time to get to the most at-risk areas.'
"If you can travel later, please do," he added.
"Today is a Sunday, thankfully, so there are expected to be fewer cars on the roads."
He added: "Monday morning has -6C possible in Scotland and -3C in northern England.
"Snow showers are forecast on Sunday and Monday in Scotland, with rain in England as it turns milder and windier.
"Gusts are forecast to reach 40mph on Monday in the West and 50mph on Thursday in western Scotland.
"Most forecast models agree temperatures will dip again from around February 14 onwards, with potential for temperatures well below zero, further snow showers and a north to north-easterly flow, although there is uncertainty."
Parts of Britain are even too cold for grit to work, according to the Department for Transport.
According to its Well-Maintained Highways guide, “spreading salt at temperatures below -5C and humidity below 80% may not prevent freezing or melt ice".
But the plummeting temperatures will be short lived, with milder air expected to push its way across the country from Sunday, the Met Office said.
UNSETTLED
Met Office meteorologist Sarah Kent said tomorrow would see "cloudy outbreaks of rain in central and southern England that will clear slowly.
"By mid-afternoon Wales and Northern England will start seeing wintry sunshine.
"On Monday night we will see cloud eventually clearing away, leaving a largely dry night for all of the UK.
"By Tuesday morning it's going to be very cold with a widespread frost with areas of freezing fog.
"Temperatures will vary quite widely between 0 and -3C, but in Scotland could dip as low as -C.
"But from Tuesday onwards it will become less cold as more Atlantic air will come in, with wind, rain and showers expected for the rest of the week."
Temperatures would be "recovering" to a more seasonal average, Ms Kent said, with highs of 11C expected tomorrow in Cardiff.
The Met Office's Simon Fisher added: "That is the beginning of milder air pushing its way in across the UK next week," he said, stating temperatures will be "nearer normal".
He added: "As a result it will be more unsettled, so windier and wetter weather through the week, so back to our normal winter."
Commuters going back to work on Monday are advised to check their journey before leaving as railways and some roads are likely to be affected.
Journeys by road, bus and train services are expected to be longer.
The Met Office says to expect "icy stretches on many untreated roads, pavements and cycle paths, particularly where snow is lying" and "increased likelihood of accidents and injuries due to icy surfaces".
Experts also warn against black ice, which can be formed by sleet and the refreezing of runoff from melting snow, as surfaces could become dangerously slippery.
Tomorrow has been dubbed "Flat Battery Monday" with cars predicted to have difficulty starting after being idle during extreme weekend temperatures.
"We’re as busy as during the Beast from the East,” said RAC spokesman Simon Williams.
TRAVEL CHAOS
Kent Road Policing Unit said it endured an "[incredibly] busy night" on Friday moving stranded vehicles to reopen the A229 and A249 after both were buried under heavy snow.
They added that they dealt with "numerous" crashes and accidents after cars were driving the wrong way down the motorway.
Motorists on the M3 were also stuck for hours after three HGV lorries jackknifed in the middle of the road ahead of today's -16C freeze.
One driver told the BBC he was forced to eat snow off the roof of his car after he became trapped.
Travellers on the M3 westbound between junctions six and seven near Baskingstoke suffered misery as snow and abandoned vehicles left tailbacks stretching to Farnborough.
And the railways were also expected to be affected this morning by the snow and ice.
South Western Railway, Great Northern, Southern, Gatwick Express and Thameslink have all advised of alterations to their services.
Debris fell on The Corridor shopping centre in Bath when part of its roof collapsed under the weight of snow on Saturday.
And guests arriving at the Longleat Centre Parcs in Wiltshire on Saturday morning were forced to sleep on the floor.
Staff had decided to let current guests stay in their villas until it was safe to leave — leaving the new arrivals with nowhere to sleep except in function rooms.
An amber snow warning was issued for an area west of London including parts of Oxfordshire, Hampshire and Buckinghamshire, with stranded vehicles and power cuts "likely", and a "good chance" some rural communities could be cut off.
On Thursday night more than a hundred drivers were forced to bed down in a pub after snow left them stranded as temperatures fell.
Motorists slept on mattresses on the floor of the Jamaica Inn, in Cornwall, after drivers were stuck on the A30 for hours.
Commuters were stranded for 12 and a half hours, a bus carrying 30 school children was rescued and hundreds of cars were abandoned on Thursday night as heavy snow hit Cornwall.
Six inches of snow reportedly fell in 45 minutes, causing travel disruption on the A30 and A39 near Bodmin, Cornwall.
Snow, sleet and rain is expected to whip back across the UK from Sunday to Tuesday, with brisk winds, although temperatures should rise as the week goes on.
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