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
More photographs of very large snowmen have been coming into the BBC inboxes. This spectacular snowman wearing a blue hat was built in Gloucestershire by a group of neighbours.
Send your snow videos and photographs to yourpics@bbc.co.uk or to our WhatsApp phone +44 (0)7555 173285.
Image source, NaomiBut not because of conditions at Northern Ireland airports.
No, it's conditions elsewhere that have led to these flights being called off.
They include flights to and from London Stansted, Luton, Birmingham, Glasgow and Amsterdam.
Compare the temperature where you are with other places around the world in this handy tool.
Where we're writing this, it's 35C warmer than it is in Yakutsk, Russia.
A campervan has been crushed by a fallen tree on the A40 near Sennybridge, Wales, closing the road.The area, near Brecon, has seen the deepest snowfall in the UK, where up to 30cm (12in) of snow has been recorded.
Image source, ReutersThe campervan crushed by a fallen tree on the A40
School closures have been confirmed for Monday across Worcestershire, Walsall and Shropshire, due to the snow.A full list of Shropshire closures can be found on the council Twitter page, external. Worcestershire County Council released its list of closures online, external.
A list of Walsall school closures is being continually updated on the council Facebook page, external.
Image source, David WalkerOne of our colleagues was snowed in today and couldn't make it to work. We'd like to say thank you to David for this pretty picture from Woodstock in Oxfordshire, and pretend we don't resent his snow day in the slightest.
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The Metropolitan line on London's Tube network has re-opened.
However, parts of the service have been suspended and there are severe delays.
There is no service from Harrow on the Hill to Amersham/Chesham/Watford/Uxbridge and between Baker Street and Aldgate due to power supply problems caused by the snow.
After spending the morning working on clearing snow and ice off the runway, staff at East Midlands Airport have re-opened the terminal. In a statement, a spokesperson said the airport was now "focused on ensuring the remaining scheduled services can depart".
Flights have also resumed at Birmingham Airport and at Luton. Stansted re-opened a few hours ago.
Passengers should still expect delays.
Hanover, Berlin, Bavaria... No, Birmingham
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This was the idyllic scene at the German market in Birmingham city centre after heavy snow fall left the UK's second largest city under a blanket of snow.
That's the message from Arriva Trains Wales, who say ticketholders for today can use their tickets tomorrow instead.
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These chihuahuas enjoyed being out in the snow.
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It's not clear how many flights have been cancelled. Ryanair's website simply states that they "have been forced to cancel a number of flights".
But they made sure they enjoyed some of the snow first.
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So much snow has fallen in some areas of the country that people have been building surprisingly large snowmen.
Lisa Chilton, her husband and her daughter in Welwyn Garden City built a huge snowman this morning in an hour and a half. Lisa's daughter named him Bob.
In Hendon, London meanwhile, Simon Coote joined with his neighbours in his cul de sac to build a snowman they estimate to be 3-metres (10 foot) tall.
But in Chelmsford Gavin Mitchell, his wife and two sons took advantage of the 7-10cm (3-4in) of snow to build their own frosty friend.
Image source, Lisa ChiltonGiant snowman in Welwyn Garden City
Image source, Simon CooteSimon Coote built this very tall snowman with his family.
Image source, Henry and William MitchellThe Environment Agency in the West Midlands will be using its 4x4s to help vulnerable people in areas affected by heavy snowfall.
Dave Throup, the agency's manager in Herefordshire and Worcestershire, tweeted that their staff and 4x4s will be "available to help vulnerable people and allow patients to get to medical appointments".
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Very community-spirited!
Image source, AFPMore on the P&O fery which ran aground in Calais during high winds.
Two tugs were used to help pull the Pride of Kent off a sandbank in the French port, a local newspaper reports.
P&O confirmed the incident in a statement and said the 300 passengers would be transferred to an alternative ship to take them to Dover.
Emergency services in the East Midlands are advising people to only travel if necessary.
The East Midlands Ambulance Service said "snow is still falling in some places [in the region] and driving conditions are very challenging"
The Derbyshire Fire and Rescue Service said that people should observe road signs if they venture out, but they should "enjoy a day chilling - it’s not often we get snow and a reason to stay at home!"
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Heavy snow causes travel problems in the East of England