Ricky's in the snow in Manchester
Snow and ice are causing big problems across the UK, with hundreds of schools closed and travelling very difficult.
Snow fell overnight in Scotland - where temperatures were -15C (5F) in places - in north Wales and northern England.
Leeds/Bradford, Liverpool and Manchester airports were all closed by the weather early on Tuesday, but some were able to open later in the day.
So far the snow has mainly hit the northern parts of the UK, but lots is forecast for south east of England too.
Ricky has an early look at Manchester's snow
In Wales almost 500 schools have been closed, while in Scotland lots have kept their doors shut since Christmas because of the weather.
This includes most schools in the Borders, Dumfries and Galloway, Aberdeenshire, Lewis and Harris.
It's the same story in Northumberland, Durham and Tyne and Wear, while hundreds of schools have closed in Yorkshire as well.
Some closures were due to frozen water, others because school buses have had problems driving on the icy roads.
A severe weather warning is in place for drivers in Northern Ireland as the cold spell is making driving conditions very dangerous there.
Sporting events have also been hit, with the first legs of both Carling Cup semi-finals in England postponed. Scottish football is also struggling with the big freeze, with a number of matches at the weekend already in doubt.