Motorists have been warned to beware of black ice on roads
Dozens of flights have been delayed, with Heathrow particularly affected
Trains around the UK are disrupted, while cross-Channel ferries face 90-minute delays
Amber weather warnings are still in place for England, Wales, Scotland and Northern Ireland
Thousands of homes remain without power, having been cut off by snow and high winds
Schools across the UK are closed after temperatures fell to -12C in some places overnight
Sunday's snowfall left beautiful scenes across the UK.
Here are some of the best pictures.
Image source, ReutersChristmas came early to Astbury, Cheshire
Image source, PAIronbridge in Shropshire looked a picture, but power outages saw people hard at work
Image source, Anne Delaney / BBC NewsSnow coated the ground in Sutton Coldfield
Image source, Getty ImagesThere were picturesque views in Richmond Park to ride by
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British Airways is reducing its flight schedule out of Heathrow because of the weather conditions.
A statement on its website says: "Heathrow is continuing to experience severe adverse weather conditions.
"As a result of the forecast of continued bad weather we have agreed with Heathrow Airport, National Air Traffic Services (NATS) and other airlines to reduce our flight schedule from Heathrow on Monday December 11."
It also says it has added some additional flights into London from a number of short-haul destinations to help passengers.
Check online here to see if your flight has been affected, external.
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Thousands of homes have been left without power after being hit by the wintry weather.
Western Power Distribution said it had restored services in the East Midlands, South Wales and the South West, but 10,000 customers were still without supply and they were working to fix the issues.
Scottish and Southern Electricity Networks also said they had brought power back to 48,000 homes, but there were still 2,900 customers without power - although they hoped to restore it this morning.
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Heathrow Airport is expecting more delays to its flights this morning.
A statement on its website said crew and aircraft were "out of position" after Sunday's wintry weather.
They advise all travellers to check online before heading to the airport and to stay at home if their flight is cancelled, checking with their operators from there.
National Rail has warned passengers to check with their train operators before travelling this morning.
Chiltern Railways, the CrossCountry network, Great Western Railway, Virgin Trains, services across Wales and the West Midlands Trains network were all affected on Sunday.
It also warned that East Midlands trains could face delays.
Pete Williams, the RAC's road safety spokesman, said they are expecting 11,000 breakdowns on Monday.
If they happen, it will be 20% higher than the seasonal norm.
"I think the big thing is people are not going to leave enough time," he said.
"Journeys will take two to three times longer. It's going to be treacherous driving conditions."
Mr Williams added that low overnight temperatures could cause black ice so urged motorists to drive slowly, leaving plenty of space between them and the car in front.
Heavy snow affected parts of Gloucestershire on Sunday, with the Cotswolds and the north of the county worst hit.
As a result, more than 100 schools in the affected areas have decided to close for Monday.
You can find the latest list on the Gloucestershire County Council website, external.
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Scottish and Southern Energy Power Distribution says they will work through the night to help the 5,400 people still without power in the south of England.
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The AA has dealt with more than 14,000 breakdowns in just one day, with hundreds of drivers stuck in snow or ice.
Edmund King, president of the AA, said call-outs were up by 40%, with the snowfall in the South East and London catching out thousands of motorists.
"I witnessed numerous crashes on the M1 just north of London," he said. "Drivers struggled even on slight inclines due to the icy conditions."
Mr King advised people to adjust to the conditions by slowing down and keeping a good distance.
He also called for more action, adding: "We need to see the gritters and snow ploughs out there as in some areas the response did appear to be slow.”