We just returned from HHI. The weather they said was a few degrees warmer than normal, but not much. We wouldn't sit on the beach, but then we live in a part of the country that's even hotter than Orlando. However, I remember when we lived in Massachusetts, and for Massachusetts people, the weather was probably fine for sitting on the beach. When we lived in Massachusetts we used to frolic at the Water Parks at WDW in November while the natives there, with their jackets on, looked at us like we were nuts. So I'd say that for you Northerners, March is about the limit, no sooner.