Temperatures fell to -13C, 8.6F, overnight, making it the coldest night of the winter, as waves of Arctic air continue to move across the UK.
The report says that forecasters had said Tuesday night could be the coldest January night for 14 years.
Bitter conditions and significant snowfall have already forced schools to shut in Scotland and northern England and sparked travel disruption.
Yellow warnings for ice and snow are in force in all four UK nations.
The unbearable weather is expected to ease at the end of the week, before possible stormy weather this weekend.
By the end of Friday, more than 40cm of snow may be seen on high ground in north-west Scotland, as wintry weather continues, the Met Office has forecast.
Snow, sleet and rain are expected to continue blanketing northern parts of the UK, though there will be some sunshine.
Heavy frosts and freezing conditions are likely across virtually the entire country, with experts warning of treacherous pavements and roads.
The low of -13C was seen in provisional recordings by the Met Office in the region of Glen Ogle, central Scotland.
The forecaster said on Tuesday that overnight temperatures in snow-covered parts of Scotland could fall as low as -15C (5F), which would make it the coldest January night since 2010.
The lowest temperature so far this winter was -12.5C, 9.5F, in Altnaharra, in early December. In January 2010, -22.3C, -8.14F, was recorded in the same Scottish Highlands hamlet.
Temperatures in most of Scotland are forecast to remain at freezing or lower throughout the day on Wednesday.
The UK Health Security Agency issued an amber cold weather warning for England this week, meaning the NHS is expected to come under extra pressure and elderly people may be more at risk.
Icy winds blowing in from the Arctic this week have seen temperatures fall 5C to 6C below the average for this time of year.
On Thursday, two more yellow snow and ice warnings cover much of the same regions, excluding some eastern areas of England and Scotland and southern parts of Northern Ireland.
The UK is braced for sub-zero temperatures until the weekend, with Tuesday seeing more than 100 school closures in Scotland and dozens in Merseyside.
All schools in Shetland were closed, with more than 50 shut in the Highlands and some sites in Aberdeenshire also affected, though some schools there have reopened.
Northern and eastern parts of Scotland saw the “bulk of the snow” on Monday, with 15cm on the ground at Aberdeen Airport.
Met Office Chief Meteorologist Andy Page has warned of drifting or blizzard conditions.
South of the border, Liverpool Council said conditions had a “widespread impact” on Tuesday, with staff deployed to clear snow around schools, hospitals and transport hubs.
On the trains, National Rail has warned there could be disruption across the network throughout the week.
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BBC/Taiwo Akinola
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