The possibility of snow is being forecast. It seems that we're in the grip of a cold front, but that there's a rainy warm front coming in from the west which might turn into snow when it mixes with the cold front.
I guess this explains the belief that if the weather is very cold, it needs to warm up a little before it will snow?
I found this rather detailed but enlightening explanation online: http://www.straightdope.com/columns/read/2051/does-it-ever-get-too-cold-to-snow
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