DH and I have been in January and in May, and have to say that we enjoyed the May trip a lot better. Both had very low attendance (they were pretty similar in the respect), but we enjoyed the weather in May a lot more. We were freezing in January, wearing sweaters and jackets. And I'm from the midwest originally, so it's not like I'm new to cold weather!! Besides, with the Flower & Garden Festival at Epcot, and Star Wars Weekends at MGM, you can't go wrong with May!!!