Going back to the World! What's the weather like in December?

[disney2mom]

We just booked a last minute trip to The World from Dec 11-15!! This will be our first trip going in December, we have always gone in May. I can't wait to see all of the Christmas decorations!!!We are staying at POR and we are going to Mickey's Very Merry Christmas party. Can anyone give me any information on what to expect and what the weather should be like?? Any information would be greatly appreciated!!