We were there this past year from Nov 30 to Dec 6 and the weather was pretty much all over the place. Luckily, we didn't have any rain, but our dress ranged from shorts and T-shirts to fleece jackets and wool hats. We didn't swim, but the pools are heated and we did see some crazy people in them...even when we were wearing our winter gear. For the most part, the weather was warm during the day...we would wear a sweatshirt or hoodie in the morning, which was most often off by midday...and then we would make sure we had jackets and hats for night. We didn't always need them, but there was one evening when we were in jackets, hats, mittens and blankets...and we are from MA! It's one of those trips where you need to pack everything.