we went over MLK in '08 and '10. Both times the weather was great. We wore long sleeved t-shirts and didn't need jackets. However, the week before we got there it was freezing. During this time the crowds were small, we didn't wait more than 20 minutes for anything (but did take advantage of fast passes). The downside is that the parks close pretty early. We went to Universal Studios one day also, and the crowds were horrible! There were HUGE groups of teenagers from Brazil and other countries in giant tour groups. Actually, the big tour groups were at Disney too, but we managed to stay out of their way there (they traveled as a GIANT pack).