I figured the Floridians here will answer that?
I can only tell you what I do with them here in NJ - when night temperatures fall steadily into the fifties F with an occasional 49 thrown in, mine come inside. Those temperatures with sunshine early mornings are no problem, but if the lower temps are coupled with rainy miserable weather, I might grab them a bit quicker.
To me there is a difference between staying happy and surviving near freezing temps....I want them to stay happy.
