Although the OP lives in Florida so the comment wasn't relevant, since this is posted in the 3 forum where many who have not had electric cars may read I wanted to provide some DATA instead of allowing this to FUD to be propagated:
1) In 66k miles on my Tesla Roadster, the worst months (Nov-Feb) average a 22% hit in range vs May-Aug.
2) In 30k miles on my S, the worst months average a 20% hit in range.
Here is some efficiency by average temp info for my S. You can see that if ambient temp is below zero, you can expect to lose 35-40% of your range on the WORST days and 15-20% in the 10 degrees above and below freezing.
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