North and Mid Wales could feel colder than places in the Arctic Circle as as freezing temperatures continue into the week.
A yellow weather warning for snow is in place for many parts of Wales - except Anglesey - from 12.05am until 11.55pm on Tuesday.
The wintry blast, dubbed "the Beast from the East", swept into the UK on Monday morning.
Yellow warning in place for most of Wales. Image: Met Office
It is expected that the worst hit areas over the next 48 hours will be eastern England and eastern Scotland - but Wales will not avoid plummeting temperatures.
A Met Office spokesman said: "Snow showers or longer periods of snow are expected on Tuesday, accompanied by very low temperatures.
"There is the potential for travel delays on roads, with some stranded vehicles and passengers, as well as delays or cancellations to rail and air travel.
"Some rural communities could become cut off. Power cuts may also occur and other services, such as mobile phones, may be affected.
By the middle of the week, the majority of Britain is being warned of the potential for delays on the roads, trains and in the air.
Lows of minus 5C (23F) recorded over the weekend marked the lowest temperature in the week leading up to March 1, the first day of spring, since 1986.
The wind chill, which could see parts of the UK feeling as cold as minus 15C (5F), rivals the temperatures forecast for parts of northern Norway and Iceland.
The Met Office said that by the end of Wednesday, more than 20cm of snow may have accumulated in some parts of eastern England, Scotland and Northern Ireland.
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