As a low-pressure system moves eastward away from the UK today it allows cold Arctic air already in place for parts of Scotland, to spread south across the rest of the UK by early Tuesday.
Met Office Chief Meteorologist Jason Kelly said: “This week will see temperatures below average for the time of year for many. Blustery winds will become confined to the far northeast overnight, with winds falling light elsewhere. This will allow widespread frost by night, though in sunshine by day, it should feel pleasant enough.
