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Anything freezing or below is pretty noticeable.
I guess I would say that I notice a difference in the fall (now) when it gets into the 40's.
Last year summer, I would get 20 mile range in the summer, but only 10 in the winter with unheated batteries. My area usually has temperatures in the winter anywhere from 0 to 20 - below zero is really cold, and anything 20 degrees or more and sunny is rather nice.
If you have far more range available in your batteries than you actually need, I don't think battery warming is an issue at all, although it may effect your top speed.
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