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New snow and wind warnings have been issued for Thursday and Friday, with Storm Goretti forecast to hit large parts of England and Wales
Large parts of the UK are covered by ice warnings for Wednesday, with a warning for snow too in northern Scotland
More than 1,000 schools are closed across the UK - with one area of Scotland already announcing closures for Wednesday
Monday was the UK's coldest night of winter so far, with temperatures of minus 12.5C in Norfolk - but Tuesday night is not forecast to be as chilly
Some football matches have been cancelled in Scotland because of the freezing conditions
We haven't seen snow like this for years, one man in Aberdeenshire tells us
The wintry weather is also hitting Europe, with snow falling in France, Spain and Hungary, and some flights cancelled at Amsterdam's Schiphol airport
One man in Scotland has been building an igloo with a working fireplace, while residents in one part of north Wales have been treated to the unusual sight of a World War Two all-terrain vehicle transporting people through the snow
Aberdeen City Council has announced that all schools in the area will be closed on Wednesday.
It says the decision has been taken due to the snow forecast, and that online learning will be available for pupils.
Most of the city's schools have been closed for the last two days - as have all schools in Aberdeenshire, Orkney and Shetland, and many in Moray.
Image source, PA MediaLittle Venice, London
Image source, PA MediaBamburgh Castle, Northumberland
Image source, PA MediaAshford, Kent
Image source, Getty ImagesLumsden, Aberdeenshire
When potentially dangerous or disruptive weather is forecast, a weather warning will be issued by the Met Office, the UK’s national weather service.
As you might have guessed, the most common weather type warned for in the UK is rain, but eight different types of weather are covered: rain, snow, wind, thunderstorms, lightning, fog, ice, and extreme heat.
Weather warnings are given a colour – yellow, amber or red - depending on a combination of two things: the impact the weather is likely to have and the likelihood of it happening.
Yellow warnings are the most common, and give you a heads up that severe weather is possible and to start planning for impacts to either travel, power or property.
When either confidence in the forecast of severe weather or the level of disruption expected increases, an amber warning is sent out, meaning travel disruption is more likely and there is a potential risk to life and property.
Red weather warnings are rare - there have only been a handful issued in recent years. You'll see them when the Met Office believes that dangerous, potentially life-threatening weather is expected imminently.
Darren Bett
BBC Weather presenter
As we've been reporting, there are lots of weather warnings from the Met Office in place today, with more due to come into force later.
More snow is expected across northern Scotland, but the main focus is on icy conditions following earlier rain, sleet and snow.
Here are the warnings for the rest of today and tomorrow:
Active now
Starting soon
Later this week
Thanks so much to our BBC Weather Watchers across the UK - some great photos of the cold weather coming in.
Here's a snapshot. Please do keep them coming - you can send in your pics here.
Image source, BBC WEATHER WATCHERS/PANMANThese boats in Llangorse, Powys, will remain moored up for the day as snow hits Wales
Image source, BBC WEATHER WATCHERS/FIGAROThese beach huts in Blyth, Northumberland, aren't likely to see much use today either
Image source, BBC WEATHER WATCHERS/MARVOThe snow in Scotland didn't prevent this four-legged friend from exploring the woods in Calvine, Perth and Kinross
Image source, BBC WEATHER WATCHERS/HAPPY SNAPPERTyre tracks can be seen in Limavady, Northern Ireland, but there's little movement on the roads as residents hunker down
Tonight's Scottish Premiership match between Livingston and St Mirren has been postponed because of the freezing weather.
The artificial pitch has frozen over at the stadium in West Lothian.
Rangers v Aberdeen is still scheduled to go ahead in Glasgow later at 20:00, but there will be pitch checks beforehand.
Four Scottish Championship matches planned for tonight have also been postponed.
They are:
On Saturday, seven SPFL fixtures were called off due to the cold weather.
Abigail Taylor
Live reporter
About 200 schools have now announced they are closed today in Northern Ireland as the cold snap continues to cause disruption to schools and transport.
A yellow weather warning for ice ended at 10:00 GMT, but a new one will come into force from 18:00 until 11:00 on Wednesday.
Image source, BBC WEATHER WATCHERS/MARKA dog in the snow in Magherafelt, County Londonderry, on Tuesday morning
As we approach midday in the UK, here's how the wintry weather has affected the country so far:
Simon King
Presenter and meteorologist, BBC Weather
Storm Goretti was named by Meteo-France due to the most severe impact of strong winds being felt in northern France.
However, it will also bring strong winds and some significant snowfall to parts of England and Wales on Thursday night and Friday.
A Met Office yellow warning for wind has been issued for south-west England from Thursday 15:00 GMT to 23:59. Gusts of 50-60mph are likely with occasional gusts up to 70mph on exposed coasts.
Later on Thursday evening, as Storm Goretti passes along the English Channel, heavy rain will spread up from the south and as it meets the colder air we’ve had in place across the UK this week, it’ll turn to snow.
While there are still some uncertainties in the detail of the forecast being a few days away, the most likely situation is that a spell of heavy snow will initially develop over the hills of south Wales.
Rain will then turn to snow more widely over parts of England and Wales during Thursday night.
A Met Office yellow warning from 18:00 GMT on Thursday to 12:00 Friday suggests that in some areas, 5-10 cm of snow may settle with the potential for up to 20 cm in some locations, especially over higher ground.
Strong winds may lead to some drifting of snow before rain and snow will then clear eastwards during Friday.
The Met Office has also issued yellow warnings for large parts of England and Wales on Thursday and Friday.
The snow warning runs from 18:00 GMT on Thursday until midday on Friday. We'll have more details soon.
It says: "Storm Goretti likely to bring heavy snow leading to disruption and difficult travelling conditions."
Image source, Met OfficeThe affected area on Thursday, according to the Met Office
The Met Office has issued new weather warnings for tomorrow covering most of the UK.
From midnight, a yellow ice warning will cover most of England, Scotland and Wales until 10:00 on Wednesday.
This follows a yellow ice warning for Northern Ireland, which is in place from 18:00 GMT tonight until 11:00 tomorrow.
In addition, a new yellow snow and ice warning covers much of northern Scotland from midnight tonight until 23:59 on Wednesday.
It's not just the UK that has been hit by snow, as these pictures from mainland Europe show:
Image source, EPA/ShutterstockSledding is the order of the day in Budapest - Hungary's meteorological service says the capital has seen 7cm of snow
Image source, Getty ImagesThe seaside resort of La Rochelle in western France has seen a relatively rare smattering of snow
Image source, Getty ImagesSnowmen have sprung up in Pamplona, northern Spain
Image source, Getty ImagesAt Amsterdam's Schiphol airport, departures boards show swathes of cancelled flights as heavy snowfall disrupts travel
Image source, Getty ImagesA man clears snow with a digger near Gartly, Aberdeenshire, on Tuesday morning
The Scottish Conservatives have called for the military to help clear snow and deliver supplies to homes that have been cut off.
Shadow Scottish Secretary Andrew Bowie describes the situation as "critical" and says the Scottish government should request Army assistance from the UK government.
Bowie says there is a real risk that people in the north and north east could be left without basic necessities unless urgent action is taken.
Over the past few days, Scotland has seen temperatures dip to -11.2C with large dumps of snow across the north. Tomintoul in the Cairngorms reported about 19.6in (50cm) of snow on Sunday.
The Scottish government has been contacted for a response.
Image source, Network RailHelmsdale in the Highlands saw another dumping of snow overnight
ScotRail has warned that trains across the north of Scotland will be disrupted for the rest of the day.
Services on the Inverness to Wick line are gradually returning, but trains on the Inverness to Kyle and Inverness to Aberdeen lines are not expected to resume until this afternoon.
LNER has advised anyone travelling between Edinburgh and Aberdeen not to attempt to travel until 14:00. Both LNER, external and ScotRail, external say they will accept tickets from the period of disruption on future dates.
And in the central belt, the Glasgow Subway has not been able to open this morning due to ice on the line causing a power failure.
Image source, Jeannie / BBC Weather WatchersMid Yell in the Shetland Islands this morning
Let's return now to school closures, which have hit all parts of the UK.
We earlier said that more than 150 schools were closed in Aberdeenshire alone. We can now report than more than 320 schools have closed across Scotland.
They were supposed to reopen on Monday after Christmas, however hazardous conditions have prevented safe travel for staff and pupils.
Aberdeenshire, Orkney and Shetland councils said all schools would remain closed today, while most in Aberdeen and Moray are also shut.
While the Highlands have also been impacted by snow and ice, their schools aren't due to return until Wednesday - after the weather warnings expire.
Darren Bett
BBC Weather presenter
Last night was a bitterly cold night. The lowest temperature last night was at Marham in Norfolk. Here the temperature fell to minus 12.5C (9.5F) - the coldest night in Marham since January 2013.
Last night was not only the coldest night of the winter in England, it was also the coldest night of the winter in the UK.
There were at least nine weather stations that fell to minus 10C last night.
Ken Banks
BBC Scotland North East and Northern Isles reporter
Tuesday has brought another amber snow warning from the Met Office, just when it seemed like there might be some light at the end of the tunnel.
I again trudged through deep snow to get to work this morning in Aberdeen - it does not feel worth the risk being on the roads, if the car could even be dug out, that is.
The roads are quiet, with schools closed for a second day after the Christmas break.
Some people were armed with shovels, clearing the snow, and a digger was also clearing a road.
It feels like the worst it has been in possibly the past 15 years. In the November and December of 2010, the area endured many consecutive days of deep snow, which again closed schools and caused major travel problems.
Image source, BBC Weather Watchers/ShaunSnowfall in Staffordshire has seen more than 85 schools closed today
As we've been reporting, snow and freezing temperatures have led to school closures across the UK this morning.
In England, more than 20 schools in Norfolk have been affected, with a further five in Suffolk, external also closed.
Staffordshire County Council, external is also reporting more than 85 school closures. And, in North Yorkshire, external, 45 schools are shut today.
Two are shut in Essex, external due to heating problems, and a school in Oxfordshire, external is also closed, due to a failed boiler.
As a reminder, more than 380 schools are closed in Wales, another 186 shut in Northern Ireland, and more than 150 in Aberdeenshire alone. We'll continue to keep you updated with any further developments.
Alex Emery
UGC Hub
Image source, Dawn CoullSeven-year-old Archie nestles into the snow on top of his parents’ car in Portlethen in Aberdeenshire.
His father Stuart says they haven’t seen snow like this for years.
"All schools are closed again today with an update expected late this afternoon. There's been more snow this morning so we're not expecting the schools to reopen," Stuart tells the BBC.
“We’re doing OK. We've walked rather than driven to the supermarket to get supplies - it was very quiet and eerie in there."
He says his family are happy enough to be working from home, and are taking the chance to enjoy the snow with Archie when they get the chance.
Darren Bett
BBC Weather presenter
Met Office yellow snow and ice warnings cover much of the UK this morning, but a more severe amber snow warning has been issued for parts of Scotland.
The warning runs from 11:00 to 19:00 GMT today when further heavy snowfall of 5-15cm (2-6inches) is expected.
The warning states that: