Last year we went to WDW in November during a cold spell.I can't imagine any kind of swimming in it. Thus, we are booking DC for this November early in our vacation.....and if the weather turns sour, we will have three more days where we could rebook if they have space(those days for us are a Mon/Tues/Wed, nonholiday time) so I think we would be able to change. That might be something to consider when you book your day.