January - worst trip we have ever had. We have been in July, September, early December, April, May and June. I will never do January again - too big of a chance with the weather. The first day we were wearing short sleeves in the afternoon while riding mouseboats on the lake. I thought this is great! The second day it became windy - very windy - so windy that mouseboats were no longer allowed even if you had paid for a week's family plan. And then the cold temperatures arrived. So cold that getting in the pool was out - just not worth the hassle of freezing your buns off to get back to the room. So cold that we were wearing thick gloves, big coats and hats in the parks in the afternoons!!! They shut down the big fountain in Epcot so that the spray would not get on people walking past. It was a huge hassle trying to do attractions wearing coats, gloves, etc. I thought of all the things we could not enjoy and I thought why have I paid my hard earned money to experience this when I could have come in a month with more predictable weather. I know people say they like January - but I personally like decent weather and a if I have to share the park with a few more people its worth it.