Why not just say the air mass has changed?

Courtesy of the BBC

Before I go on, I do realise that it usually feels warmer out of the wind than it does when you’re in it – the infamous wind chill effect – and although I agree with Louise Lear that wind speeds will decrease across the UK during this week as the gradient opens up and daytime maxima increase, there is a little bit more to it than putting it down to lighter winds. Much more importantly is the fact that the air mass thats over the UK will subtly change from an Arctic maritime to a Polar maritime as warm air overrides the anticyclone to the northwest, and that’s the main reason why it’ll become become less cold by day this week, and not because of lighter winds, which perversely could well mean that nights this week may be colder under clear skies.

Courtesy of wxcharts.com
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