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depends if you have all seasons or summers.
With summer tires - you should make the switch as soon as temps drop consistently below 70 degrees. They continue to lose their grip as temperatures drop further to the point of being dangerous below 45 degrees.
This is according to the tire manufacturers anyway.
Snow has nothing to do with it, the rubber turns to plastic. Your summers should be stored somewhere heated, because the extreme cold (below about 20) will damage the tire to the point that it can't be run anymore even when warmed back up.
With all seasons its less critical, and your municipality allows it, you can switch once it becomes truly cold. They don't lose their grip as quickly as temps drop but don't have a snow tread pattern. If you get heavy snow, just change them out when snow season begins whether it actually started snowing or not.
Seth
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