A.B.
We always go to Floridia in August, and in December, to visit some relatives that live there. When we go in August, it is so hot, and great for swimming. In December, it is usually warm enough for Shorts/Capris and T-shirts, and the kids do have fun swimming with there cousin, but I think it is pretty cold, but they probably warm up fast. If you are going in February, then it will probably be a little cold to swim........I would suggest indoor pools if you want to swim. You could always pack swim suits, and see how the weather is.
Good Luck, and have fun at disney if you go!!!!