The Florida weather can always surprise you. Last year we went towards the end of May expecting cloudless skies and we got quite a lot of rain.
Don't let this put you off, May is usually a wonderful month to visit, we were just unlucky.
I've been at many different times of the year and it can be hot, cold, dry or wet just about any time. Well, maybe not cold in the summer, but you get the idea. I think Spring and Autumn are the best times overall.
Strangely, one of our trips with the least rain was when we went in August! Hardly saw a drop! You never can tell.
Kev