Following a weekend gripped by the coldest temperatures of 2017, the freeze is expected to loosen its hold on Wednesday.
But a severe yellow weather warning will continue until 11am across most of England, Wales and Scotland, as remaining ice threatens treacherous conditions on roads and paths.
The coldest temperature of the last five days - in Shawbury in Shropshire - was a low of -13C, with the mercury in Powys falling to -10.1C and in Loch Ness -9.1C.
In Oslo temperatures were -6C and Moscow -2C.
Many areas enjoyed a blanket of snow thick enough for sledging and snowmen - in Sennybridge, Wales, 30cm of the white stuff was recorded, while High Wycombe saw 18cm fall.
Across the country, that had a knock-on effect for hundreds of schools which were forced to close.
Severe weather warnings were in place into Tuesday, and icy roads and compacted snow led to concerns of treacherous conditions.
Thousands of homes were also left without power. Western Power Distribution engineers restored power to 99,500 homes, while SSE restored power to 50,000 homes across Wiltshire, Oxfordshire and Berkshire on Sunday.
The freeze also coincided with the beginning of cold weather protocol for homeless charities, and cold weather shelters in the UK opened their doors to people sleeping on the streets.
Disruptions also grounded flights and caused delays to and from airports including Birmingham, Manchester and Edinburgh. British Airways cancelled 170 flights on Sunday and more than 100 on Monday.
Meanwhile, rail disruptions caused travel chaos, with cancellations between Birmingham and Bristol after a landslide caused by the severe weather.