Forecasters warned, snow will fall in almost every part of the UK, with wintry conditions lingering well into March.
The Met office said, wintry conditions are expected to grip much of the country by Tuesday evening, having already swept across Kent and Essex.
Kent Police said the “heavy snowfall” had led to treacherous conditions for drivers on Monday morning, leading to several crashes on the M20.
Weather experts believe it will be one of the coldest weeks of the winter so far – and parts of the UK were blighted by sub-zero temperatures overnight.
Katesbridge, County Down, recorded the coldest conditions of -6C, followed by -5.6C in Altnaharra, northern Scotland, and -5.6C in Redesdale, Northumberland.
Snow and ice warnings have been issued for swathes of the country.
Snow showers left between 1cm and 2cm in Kent and Essex on Monday and are expected to get lighter in south-east England throughout the day.
Temperatures are expected to dip to about -11C (12.2F) on Tuesday night in the Scottish Highlands, and it is set to feel bitterly cold across parts of northern England.
If the mercury dips below -13.7C tonight, it would surpass 21 January as the coldest night of the winter so far.
Freezing temperatures have already led to travel disruption in parts of the UK, with snow and ice creating treacherous conditions on the roads.
Met Office spokesman Martin Bowles said: “Tonight is going to be very cold, there is a front coming into the North West and because we have got lots of cold air there is going to be lots of snow on it.
“It is reaching north-west Scotland and Northern Ireland this evening and then it will gradually work its way into north Wales and north-west England overnight, including a good chance of some fairly substantial settling of snow in those areas.
“During tomorrow, it will continue to work its way into the South East, but as it does so it will become a much weaker affair so actually pretty much the whole country can expect to get some snow between six o’clock this evening and six o’clock tomorrow.”
Kent Police said two crashes took place in the space of one minute on Monday morning, at 8.29am and 8.30am between junctions eight and nine of the M20.
The first saw a car overturn, leaving one person with minor injuries, while across the carriageway a lorry and a van collided, flipping the van and injuring one passenger.
Police said conditions were poor on a wider part of the network.
“Be aware. Extra time. Allow space watch for changing road conditions. If you get stuck stay with your car leave engine running. If you are able, Low gear low revs keep moving,” the force tweeted.
Sleet and snow is expected in parts of eastern England; western areas of the UK will be hit by sleet, snow and hail showers – some of them heavy; and a spell of sleet and snow will continue to move southeast across the UK.
Predictions of bad weather forced British Airways to cancel 70 short-haul flights to and from London’s Heathrow Airport on Monday and a further 10 on Tuesday.
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