Will it snow?

winter_trees

My daughter was hoping for a white Christmas but, given that we live in the warm, south-western corner of England, the chances of snow each winter are small and the likelihood of snow on Christmas Day is even lower. And even though we’ve had days when it’s been cold enough for ice to form on the car windscreen, I don’t think we’ve seen any snowfall for a year or two. So, what has to happen for it to snow?

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