Global 2010: How cold does it have to snow?

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Usually, the temperature has to be 37 degrees or colder at the onset of snow, in which, the snow will fall, but melt on contact.

Temperatures where we live, under conditions such as evaporative cooling take place can be as warm as the low 40's.

Obviously, it has to be below freezing up in the clouds, meaning below 32 degrees.

http://answers.yahoo.com/question/index?qid=20101122080911AAB8fK9

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