Our last family trip was in November and it was pretty much spectacular ... good weather, fairly light crowds, etc.
However, I'd like my family to have the whole holiday WDW experience so we are going Dec. 5-11 this year.
About the temps ... we have also gone in early Feb. I laughed at the post from the person living in FL who wore a fleece while others were in shorts. We're from the Chicago area and on that Feb. trip, we thought nothing about wearing shorts & light jackets. Our FL friends were, however, in jeans and sweatshirts.
I am counting on the the early December weather being better than whatever we have it home regardless. And ... it's WDW at Christmas .... so who cares?