WE LOVE JANUARY!!!!!
Coming down from Northern Ontario it is such a nice break from our COLD

winter weather!
We were fortunate enough to be able to go to Disney the last 2 years in the Buy 4 get 3 Free deal that Disney had!
Here is my 2 cents - for what its worth -
WEATHER - In 2009, we were there the week after MLK day. The first few days were pretty chilly! Still much warmer than it was at home so we were fine. The locals however were wearing parkas and hats and mitts! It did warm up quite a bit and we did swim at the pool but we didn't go to a water park.
This year we went a week later and the weather was PERFECT!!! It was between 75 and 78 degrees ALL WEEK LONG!!! I think we had the best weather of the whole month! Our last day there was only 52 degrees and it was COLD!!! By that time we had acclimated to the weather so it we were pretty chilled even though we were wearing jeans and sweaters!
The weather is pretty much unpredictable but the crowds are unbeatable!!
There were tour groups there but you can avoid them if you see them - they travel in large groups and all wear the same colour shirts and have large flags that they carry with them wherever they go!!
Last year we were in Disney for 10 nights. This year only 7 and I would say that we were able to do just as much in 7 days with fewer crowds then we were able to do in 10 days with slightly higer crowds!
We are hoping to try early February next year only if Disney puts out a deal or we get a good PIN. Other wise it will be a year or more before we are able to go back again!
Check out my TR from this past January if you are interested!!
EDIT - btw - Discounts for January-MArch usually come out in AUGUST - NOT NOVEMBER!!!