Snow is continuing to fall across the north of the UK, with up to 10cm settling across the high mountains overnight.
Glasgow and Edinburgh have seen up to 5cm fall overnight, with up to 4cm settling in Teesside and County Durham.
The mountains in Cumbria, Northumbria and parts of Scotland have been decorated with a blanket of 10cm of snow.
Sky's weather presenter Isobel Lang said: "Winter started on December 1 and the weather has become more seasonal.
"In fact it looks set to stay that way with a continued threat of frost, ice and snow.
"Even looking ahead towards Christmas the rather cold and wintry story continues."
And the rest of this week is bound to be frosty, said Lang.
"On Tuesday colder north winds will bring in more widespread snow showers across northern and eastern Scotland, with these spreading across hillier parts of eastern England on Wednesday," she said.
"During Thursday another Atlantic frontal system is set to sweep east bringing in more persistent rain, preceded again by a period of snow."
Further south, including Lincolnshire and Yorkshire, escaped the snowfall but were greeted with rain and very cold temperatures instead.
Eastern England shivered in temperatures dipping to -4C and it dropped to -7C in western Scotland.
But hasn't been cold all over Britain - areas of Cornwall and west Wales enjoyed far warmer highs of 11C.
The extreme weather in parts of the UK caused signal failures on transport, meaning delays for passengers on Sunday.
The big chill comes just days after severe flooding hit Britain, from which many areas are still recovering.