Heavy snow has led to power cuts and disrupted air, rail and road travel in many parts of the UK.
The deepest snow was in Sennybridge, near Brecon in Wales, where up to 30cm (12in) was recorded, while High Wycombe saw 17cm, and the flurries also reached London and southern England.
Snow is forecast to stay in Northern Ireland and Scotland but give way to icy conditions elsewhere overnight.
A Met Office yellow “be aware” warning for ice affects England and Wales.
A P&O ferry, the Pride of Kent, ran aground in high winds at Calais, in northern France. There were no injuries and the ship was re-floated within two hours, although passengers were transferred to another ship.
Electricity supplier SSE says up to 24,000 homes in Oxfordshire, Berkshire and Wiltshire were left without power after snow and wind saw tree branches coming into contact with overhead network.
Across the South West of England and Wales, about 2,900 customers have been affected by power cuts. Western Power Distribution said it was hoping that number will decrease quickly as the weather eases across the region.
A campervan on the A40 near Sennybridge has been crushed by a falling tree. Dyfed-Powys Police said the road was closed between Llandovery and Halfway.
Elsewhere, drivers have been advised by police to avoid non-essential journeys.
Schools in Birmingham will be closed on Monday, while a Harry Potter event at the city’s Genting Arena on Sunday evening was postponed after ticketholders concerned about travelling to the venue contacted the organizers.
A landslide is affecting Cross-country trains between Birmingham and Bristol.
An amber warning for snow was extended on Sunday to cover Gloucestershire, Wiltshire, Oxfordshire, Buckinghamshire, Hertfordshire and Essex but areas such as Liverpool and South Yorkshire were downgraded to a yellow “be aware” warning.
Temperatures reached lows of -10C (14F) in some parts of Scotland and Wales, falling to as low as -14C (6.8F) in isolated rural areas.
The Met Office says ice is likely to be the “main hazard” over the next 24 hours as it issued a further yellow “be aware” warning for snow and ice in Scotland and Northern Ireland.
It warned of icy surfaces on Monday in Wales and in the Midlands, East of England, London and the South East, the North West, South West, and Yorkshire.
“Ice is expected to form across many places overnight into Monday morning. Some injuries are likely from slips and falls on icy surfaces as well as icy patches on some untreated roads, pavements and cycle paths,” it said.
“As well as this lying snow from Sunday will continue to be a hazard leading to longer and potentially hazardous journeys.”
The British Red Cross has also been asked to help move blood supplies and other medical equipment in some areas.
The runway at East Midlands Airport was closed for several hours causing delays to flights and some cancellations to Jet2, Flybe and Ryanair services.
Birmingham Airport had suspended flights so staff could clear snow from the runway.
Heathrow Airport says both runways are currently in use but staff are prepared if either needs de-icing later. However, British Airways say it has cancelled more than 70 flights.
Earlier, Luton Airport had to shut its runway and temporarily suspend flights and the runway at Stansted Airport, where about 50 flights were cancelled, had to be cleared.
Local events have also been affected by the weather, such as the final day of Lincoln Christmas market, which has been cancelled over safety concerns.
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