Christmas time in Disney is one of the best times of the year to go. I've only gone once during christmas b/c my mom is a CM and they cant go on vacation during December. Mickey's Very Merry Christmas party is REALLY good. All the parks and hotels are decorated w/ fake snow and mickey-shaped wreaths. The Osbourne Lights in MGM are really spectacular and the Candlelight Procession in Epcot tells the story of Christmas and its really pretty and nice. The weather was pretty warm. We wore mostly shorts during the day, but changed into pants and brought a light sweatshirt for the nights, because they tended to get a little chilly. Hope I helped!