Hi, Mandi! The weather is usually quite pleasant at the end of November/early December. The days are nice, around low 70's with cooler evenings. For my family, I usually pack bathing suits. (We're from Ohio, so if its sunny out and over 60 degrees, my kids are in the pool!) Most of my family will wear shorts during the day, and put on a sweatshirt or jacket in the evenings.
But, as you know, weather changes quickly! A day or 2 before your trip, check
www.weather.com for the forecast. Plan accordingly with bringing jeans, umbrellas, or even mittens if it looks like cold evenings!
With the nice weather, fabulous holiday decorations, and manageable crowds, this is my favorite time of year to go to WDW. In fact, my family and I are coming down that weekend - we can't wait! Wishing you a magical vacation!