The Met Office has also has two yellow weather warnings of snow and ice in force until this afternoon covering southern England and Wales, as well as the eastern edge of the United Kingdom from Shetland to The Wash.
There are warnings of rail delays and cancellations, power outages and the cutting off of rural communities.
In Cornwall, snow is as deep as 15cm in the area of Bodmin Moor.
Police forces across the country are warning motorists to consider if their journeys are necessary before heading out on Friday and be "extremely careful" if have to travel by road.
What does the weather warning say? .
Yellow warning from the Met Office for Scotland early Monday.
Speaking on Friday, Met Office meteorologist Bonnie Diamond told i: "Tomorrow will be a cold day with an icy start, with some snow and ice in north-east Scotland, Western Isles and parts of Northern Ireland where there could also be wintry showers because of the wind direction".
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The lowest ever temperature in the United Kingdom in January was also recorded in Braemar when temperatures plummeted to minus 27.2C (-16.96F) in 1982.
As snow and ice set in across Northern Ireland over Friday and Saturday some parts of the Province will see feels-like temperatures drop to as low as -8°C.
The Met Office said there is a 60 per cent chance of a sleet shower at 6pm which will turn into heavy snow by 10pm. "The highest snowfall accumulations are likely to be in areas above 150 metres or so".
Brits have been warned to leave work now as more snow later this evening could grind the travel network to a halt.
Snow fell in the city last night but melted by the time morning arrived.
Met Office forecaster Mark Wilson said the cold temperatures were due to stick around.