Amykay, I took it upon myself to be the "unofficial" pool tester during my December/January WDW vacation. I can assure you that even if it is chilly outside, the pools should be warm enough for you to enjoy. I swam in the CBR, OKW, AKL, CR, and BWV pools (I actually stayed in all those resorts during my vacation since I spent 3-1/2 weeks at WDW). And I did midnight swims just about every night. For my midnight swims, the "bull's-eye" pool at the CR was the warmest, followed closely by the "clown" pool at the BWV. At the "clown" pool, the hot water seeps into the pool at various times of the evening. Sometimes you'll feel cooler water coming out of the water jets, and other times you'll feel the warm water coming out. I usually spent at least an hour in the pool every night and found that the warm water came out of the water jets a couple times an hour (maybe every 20 minutes or so).