I've gone three years in a row the very first week in January (school I taught at started later after holidays). Crowds were always very low. CM told me she thinks they budget their money only til New Years, then everyone leaves right after. But all 3 years were very cold! A few "Polar Bears" in the pools, but often you could see your breath in the morning. Once, at AK, morning animal shows were cancelled because of the cold. Enite one early January was almost literally freezing, no one on Splash Mountain, very slow overall. Yes, I'd definitely go in early January again-no problem finding a spot for fireworks! Also, it IS WDW. Loved the low crowds.