We're due to be out on the 13th December, and have spent quite a few Christmases (sorry I know it looks wrong!) in Florida. Weather can be very unpredictable. It can be gloriously warm - particularly during the day, but is often chilly at night. And sometimes it just rains, darn it, just have to spend the day shopping!
I say chilly - it's still a heck of alot warmer than it is at home! Of course we stand out as the tourists because we wear shorts and t'shirts during the day and the locals are in jumpers, and then in the evening go out in jeans and a jumper and they are wrapped up in a coat!
I take a lightweight coat, a scarf and gloves plus shorts and jeans, layers of t's and jumpers.
Never known a park shut except on Christmas Day and New Year's Eve when MK and MGM are fill to bursting pretty early on. But I don't expect to swim at the water parks. And Wildcat's suggestion about pool heating is spot on, otherwise you have to be very hardy to get more than your big toe in!
It's our favourite time, we get our christmas deccies out, try and compete with our American neighbours (and lose of course!) for most outside lights, and just driving round adds to the whole occasion. And first stop after the tree will be Mickey's Very Merry Christmas Party. Also don't forget to visit Downtown Disney, they have a beautiful tree with singing there every night, and it's open until late, absolute magic atmosphere.