We went once the Saturday after Thanksgiving and stayed a week. It was GORGEOUS! Low 80's by day and maybe cool enough for long sleeves or light jacket by night. Lovely! We went during Thanksgiving last year and it was much cooler - in the upper 40's one night. The days were 60's mostly, maybe one day it reached the 70's. Kind of chilly for my blood. I think it's iffy. We went once in January and it was HORRIBLE - freezing...
We've been to Disney during Jan, Feb (it was a bit chilly), May, June, July, August, September, November, and early December. I'd say the winner as far as weather was September. We don't like it to be in the least bit cold, but I will say that we were there in July and it was brutal. I'm getting less tolerant of weather in my old age. I'm 43.
PamNC