We did Dec. (early December- 8-14th I think) of 2008 and early June in 2007. June was busy but bareable (espcially with fast passes, etc.) but I also agree, the heat can be a killer. Not that bad though in early June. I think if memory serves me (in research)...that July/August is actually much worse temperature and humidity wise. December (early mind you) was light crowds but there were times we were wearing fleeces (cause it was chilly at night). Easier to get reservations, etc. We are going again this June (last minute plans) I prefer December, but logistics aren't going to allow this December and we got pin code for dining. We are going 2nd week (wish we could go 1st week but my girls have dance recital). THe good news is I think that alot of schools don't get out til later in December or at least in the midwest and east there will be a lot of snow days schools have to make up for in June (that's what I'm hoping). I work in the schools and luckily we don't have any to make up ..... yet:lookaroun