A sudden cold snap is sweeping Britain today, with northern Scotland the first area of the country hit by the freezing temperatures.
North-westerly winds whipping off the Arctic are expected to bring at least two weeks of wintry conditions, making November up to 3C (37.4F) colder than last year.
Temperatures are expected to fall below zero across the country and peak at just 4C (39.2F) or 5C (41F).
People in the higher regions of Scotland are also expected see the season's first blanketing of snow - with further wintry showers set to move south as the week progresses.
Sky News weather presenter Nazaneen Ghaffar said the entire UK would see the mercury plummet by Tuesday.
"North-westerly winds will bring a much colder air-mass this week and temperatures will be just below the average for the time of year," she said.
"Overnight frost and ice is also expected under clear skies, where temperatures will plummet below freezing for most."
She added that some parts were likely to see their first glimpse of snow for the winter.
"Some snow is likely as well, mainly over Scotland, Northern Ireland, northern England and north Wales," she said.
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