You are coming at a great time! The average temperature at that time is 73degreesF. Which means nice cool evenings, but you may still be able to swim at your resort or the water park as they are all heated. The crowds are some of the lowest, much different than a couple of weeks later. You will be able to enjoy the Christmas decorations and festivities, attend a Mickey’s Very Merry Christmas Party and do your Holiday shopping, if you would like to.