The difference in temperatures is due to weather systems from the Atlantic trying to “extend their influence”.
One of these is described as “a dense pool of cold air over Scandinavia”.
Met Office Chief Meteorologist, Neil Armstrong, said: “A weather front moves north eastwards across the UK bringing rain which turns to snow as it pushes further north and meets with colder air.
“This system has prompted a number of warnings including a rain warning for Northern Ireland, while snow warnings will be in force for parts of northern England and Scotland.
“In locations higher than 200m across northern England and southern Scotland we could expect to see around 2 to 5cm of snowfall, but areas of similar elevation north of Glasgow and Edinburgh could see up to 20cm of snow.”