Britain is bracing itself for an icy blast over the coming week when temperatures will plummet below freezing to bring snow and widespread frosts.
The chill weather - the first wintry spell for many - will be a sharp change from the mild weather last month, the wettest on record and the warmest ever December, when temperatures averaged 7.9C (46.2F).
Forecasters are predicting a wet start to the week, with wintry showers especially on high ground, before an area of high pressure towards the weekend will see temperatures struggling to reach 5C (41F) in the South and not rising above freezing further north.
Motorists, pedestrians and cyclists are being warned of the risk of frost and ice on roads.
There are also forecasts of rain, and the Environment Agency still has more than 150 flood alerts and warnings in place across England and Wales following the devastating Christmas and New Year floods.
Mel Harrowsmith, head of civil contingencies at the Met Office, said: "For many the weather during the coming week is likely to be the first experience of winter, with either frost, wintry showers or even snow affecting many areas of the UK."
During the early part of next week cold air will spread southwards, bringing the chance of frost, ice and, for some, the possibility of sleet, snow and hail, the Met Office said. Daytime temperatures are likely to be in the range of freezing to 5C (41F).
In Pictures: Floods hit the UK
In Pictures: Floods hit the UK
1/17 Floods hit the UK
Members of Cleveland Mountain Rescue and soldiers from 2 Battalion The Duke of Lancasters Regiment evacuating people from the Queens Hotel in York city centre as the River Ouse floods on December 27, 2015
2/17 Floods hit the UK
Teams in Whalley evacuate villagers from their homes
3/17 Floods hit the UK
A resident of Glenridding, which flooded for the third time this month, surveys the damage
4/17 Floods hit the UK
The River Ouse, York, has burst its banks
5/17 Floods hit the UK
A soldier from the 2nd Battalion, Duke of Lancaster’s regiment helps to sure up flood defences in Appleby, Cumbria, one of the areas worst affected by the floods
6/17 Floods hit the UK
Experts believe the cost of clearing up the most recent flooding could exceed £50m (PA)
7/17 Floods hit the UK
Hundreds of people have been evacuated from their homes in York
8/17 Floods hit the UK
A police helicopter photographed the extent of the flooding in York on 27 December.
9/17 Floods hit the UK
Flooding at Clifford's Tower in York on 27 December
10/17 Floods hit the UK
Flooding along York's Inner Ring Road on 27 December
11/17 Floods hit the UK
Water runs out of the Lowther pub in York on 27 December after the River Ouse bursts its banks in York city centre.
12/17 Floods hit the UK
Flooded streets in Dumfries, Scotland on 30 December
13/17 Floods hit the UK
A car left submerged in floodwater in Newton Stewart, Scotland
14/17 Floods hit the UK
Staff at the Worlds End bar in Dumfries Scotland desperately try to pump floodwater out of the building
15/17 Floods hit the UK
A man stands in the doorway of his cottage in the flooded town of Straiton in Scotland
16/17 Floods hit the UK
Flooding in the village of Aberfeldy, Perthshire, Scotland
17/17 Floods hit the UK
Man wades through floodwater outside a fish and chip shop in Dumfries, Scotland
Southern Scotland and parts of north-east England, particularly the high ground over the Pennines, received a dusting of snow overnight, and Billy Payne, a forecaster with MeteoGroup, said more was likely in the coming days.
He said: "We are still going to have some outbreaks of rain and mainly hill snow for Scotland, particularly in the south. It will be cold in northern Britain, between 4C (39.2F) and 7C (44.6F), and around 6C (42.8F) to 9C (48.2F) in the South."
Monday and Tuesday will see "messy" weather.
Mr Payne said: "An area of low pressure will bring rain and showers, with a chance of anyone seeing rain or showers tomorrow, particularly in the East during the morning, and in more northern and western parts throughout the day.
"There could be some snow over northern England during the morning, mainly on high ground again.
"It will be colder in the North, around 3C (37.4F) to 6C (42.8F), and 6C (42.8F) to 9C (48.2F) in the South, not far off normal for this time of year, but compared to December's weather it will certainly be feeling a lot colder."
Low pressure on Tuesday and Wednesday will move away to the East, and chill north-westerly winds will cause temperatures to drop off, with wintry showers on both days.
On Wednesday temperatures will peak at 7C (44.6F) in the South and 5C (41F) in the North, but on higher ground in Scotland it will struggle to reach above freezing, Mr Payne said.
He added: "On Wednesday and Thursday there could be an area of low pressure coming in from the North West, bringing the potential for longer spells of rain, sleet and snow more widely, even across England and Wales.
"The end of the week may be a bit drier as an area of high pressure comes in, but temperatures will drop to 2C (35.6F) to 5C (41F) in the South and not rise above freezing further north, with widespread frosts overnight across the whole of the UK."
Looking ahead, the third week of January is likely to see weather becoming slightly milder as Atlantic weather systems try to push across the country, bringing rain and strong winds.
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