We were there last year, Dec. 6 - 14th, and at the WL, too! Oh, so BEAUTIFUL! Unfortunately, it rained a lot, but I think that was unusual. I was very comfortable in my capris almost every day. It was in the 50's, 60's (and 70's one or two days). I also wore Teva sandals, which were a blessing, even when it was 60 degrees and rainy. I wore sweatshirts, long sleeved shirts, and short sleeves.
DH wore his sneakers and wished he had worn his sandals when it rained (poured). Less people venture out in the rain, so we were able to do a lot.
Take time to enjoy this beautiful resort - the Christmas decorations are the best. And keep checking for a good room rate.
Oh, how I wish we could go back this year! Have a GREAT time!