Snow is falling in London as up to 15cm blanketed some areas of the rest of the country.
Met Office snow and ice warnings remain in place for the majority of the UK until midday but forecasters say the weather system will move on by the afternoon.
People have reported snow falling in London, while others have shared photos of dustings in Oxfordshire and Cambridgeshire.
I don’t wish to alarm anyone, but there is actual snow falling in London right now... pic.twitter.com/EYn0PIUfmB— Matthew Lumby (@MatthewLumby)February 27, 2020
— D.Jiménez (@FutDerickJ)February 27, 2020
— 🅐🅑🅗🅘 (@AbhishekGureja)February 27, 2020
Met Office meterologist Luke Miall said that Loch Glascarnoch in Scotland saw up to 15cm of snow by 6am.
Meanwhile, Lake Vyrnwy in Wales has seen at least 5cm and Leek in Staffordshire has had 6cm of snowfall, he added.
— Met Office (@metoffice)February 27, 2020
Some roads and rail networks in the north and Wales are facing disruptions due to the weather but the majority of routes are operating as normal.
Mr Miall said: "During the night we have seen an area of rain, sleet and snow pushing across some southern and central parts of the county."
— Jessie Smith (@jsmithlawyer)February 27, 2020
"But it is the north and northwest of the country that have seen the heaviest amounts of snow."
He added that the largest amounts of settled snow have covered higher grounds in Scotland, Northern Ireland, northern England and the North Midlands.
— David Allison (@Bionicbadger)February 27, 2020
"Oxfordshire and the South Midlands have reported snow but it is mainly wet stuff and so it is unlikely to settle on the ground - maybe cars and grass but not on the roads." Mr Miall said.
"North London is right on the periphery of where this rain and snow devide is so there have been reports of snow in London but this snow is more wet and not likely to settle."
— Sarah Lewis (@PurplefacePhoto)February 27, 2020
Mr Miall said the weather front itself will have moved on by Thursday afternoon with the rest of the morning seeing some smaller outbreaks of sleet, snow and rain.
But by lunchtime the system will have cleared over the east coast and it will start to warm up as the sun arrives, he added.
— Kate Campbell (@katelmcampbell)February 27, 2020
Temperatures had dropped to -4C in Scotland and 1-4C in the south overnight, but Brits can expect the mercury to rise over the next few days.
However, the weekend is set to be very windy with the potential of gales up to 50mph, so it will still feel very cold, Mr Miall said.