Simon King
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What is a polar vortex and why is it making it so cold?

8 November 2016 Last updated at 15:55 GMT

The temperature has dropped across the country this week, and there might even be some snow on the way!

But, other than it being, well, winter - what's behind this sudden cold snap?

Well it's all down to the scary sounding "polar vortex". Confused?

BBC weather presenter Simon King has the answers.