The Met Office has recorded the lowest temperature of the winter so far in the UK at -12.5C.
The village of Marham in Norfolk, eastern England, was the coldest place in the country on Monday night, followed by Dalwhinnie in the Scottish Highlands, which reached -11.2C.
It comes as hundreds of schools in northern Scotland will remain closed for a second day as weather warnings of snow and ice continue across the country.
The forecaster has issued an amber warning for snow in large parts of northeast and northern Scotland from 11am until 7pm on Tuesday, with the Met Office warning of 5 to 10cm of snow widely, and up to 15cm in places.
Meanwhile, disruptive snow, wind and rain are expected to hit parts of southern England this week, as an Atlantic low-pressure front meets an Arctic airmass over the country.
The Met Office said that even parts of the south may see some snow on higher ground come Thursday and Friday, while northern and central areas of England could face more snow with rain and strong winds, depending on the path of an approaching Atlantic low-pressure system.
Forecaster Aidan McGivern said in a video posted on the Met Office’s X/Twitter account that there is a 20 per cent chance the system takes a northern route, which would bring widespread “disruptive” wind and rain to much of England and Wales, and possibly more snow in northern England, southern Scotland and Northern Ireland.
Other areas that reached the lowest temperatures overnight included Tulloch Bridge in the Highlands, which dropped down to -10.7C, Santon Downham in West Suffolk at -10C and the Bala in north Wales at -9.6C.
The UK Health Security Agency (UKHSA) has issued amber cold health alerts for England as an early warning that adverse temperatures are likely to affect health and wellbeing, running until Friday.
Hundreds of schools were shut on Monday and Tuesday across the UK, while some flights were cancelled and trains were disrupted.
Meanwhile, hundreds of thousands of households are getting £25 cold weather payments to help with heating costs amid the dropping temperatures, the government said.
They are for vulnerable people, including pensioners, to help pay for heating when the temperature dips below freezing.
Cold weather payments have been triggered on four separate days – 30 December, 1 January, 2 January and 3 January – covering a total of 451 postcode areas in England, Wales and Northern Ireland.
Matthew Lehnert, chief meteorologist at the Met Office, said: “As we begin the first full working week of the year, we face a range of winter weather hazards with snow showers and ice.
“In the north of Scotland, snow showers are expected to become more frequent on Sunday night, with some locations within the amber warning areas seeing a further 20 to 30cm accumulate by Monday morning.
“Elsewhere in the UK, snow showers, ice and frost are expected at times, but milder air will make attempts to spread eastward from Tuesday. This will mean rain becomes more likely in the south, but there is also the possibility of more organised snow along the boundary of the mild and cold air masses. Strong winds could also be a feature later in the week.”
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