Parts of the UK have had the coldest night of the autumn so far with temperatures plunging to almost -10C.
A temperature of -9.9C was recorded overnight in Braemar, Aberdeenshire.
Nine of the 10 coldest locations overnight were north of the border, but the coldest location in England was Redesdale Camp in Northumberland, where the temperature was recorded at -7.1C.
On Sunday night, temperatures had equalled the lowest of the autumn so far, reaching minus 8.1C (17.4F) in Tulloch Bridge and Dalwhinnie in the Scottish Highlands.
More cold weather is predicted for the UK over the next 24 hours, including the north east, north west and Yorkshire and Humber regions.
A yellow weather warning for dense and freezing fog was in place on Tuesday morning across large parts of England and eastern Wales.
According to the Met Office, the freezing fog will “linger” across parts of England and Wales throughout the day. Temperatures will struggle to reach double figures across much of the country.
During rush-hour, drivers from Brighton to Manchester had to contend with lower visibility and iced-up cars.
North West Motorway Police tweeted to say they had received reports of a "few" accidents, adding: "the gritters have worked tirelessly all night, but it's still icy out there."
Meanwhile, Public Health England (PHE) also issued a cold weather alert until midday on Wednesday and urged the public to look out for the "most at risk".
— Met Office (@metoffice)November 19, 2019
PHE consultant Dr Emer OConnell warned that extreme changes in temperature can increase the risk of heart attacks and chest infections.
"Older people and those with heart and lung problems are at risk of getting sick in cold weather," she said.
"Keep an eye out for those who may need help staying warm, ensure they wear lots of thin layers and have everything they need.
"Below 18 degrees, changes to the body mean that the risk of strokes, heart attacks and chest infections increase so heating homes to this temperature is particularly important to stay well."
Some of the most extensive fog is through the Thames Valley - this webcam from @trafficengland shows tricky driving conditions on the M4 west of London.
Please allow some extra journey time this morning
Are you #WeatherReady? pic.twitter.com/4LGhy2S8Fp— Met Office (@metoffice)November 19, 2019
But it added that the current cold spell may soon come to an end, with temperatures recovering throughout the week.
Met Office chief meteorologist, Steve Ramsdale, said: "After a very wet period for parts of the UK the weather is now turning much quieter for a few days.
"With these quieter conditions, night time temperatures will fall away with more widespread frosts than seen recently, despite daytime temperatures remaining fairly similar.
"Tuesday morning in particular looks to be cold across much of England."