This past January (2015) it was cold most of the week - 50's-70's. We are from just outside of Boston so anything without snow was great but we wore jeans and sweatshirts for most of the week. We had brought down jackets for our boys for our return (3&4) and ended up using them while we were there. Other years we have gone and it has been gorgeous - 70's-80's with a day or two that is hot hot. It seems to be a toss up. I have pics from 2013 of my then 2yr splashing in the bubble jets in Epcot because it was so nice. Sorry, I haven't been much help but I believe that it is typically in the 70s for the end of january (we've gone several times then). Last year was more of a fluke but I always pack at least 2 pairs of jeans/pants.