We'll be at Fort Wilderness Jan28-Feb11, and we were there the same time frame last year. We had great luck with weather, and it was really warm almost every day (high 70's, low 80's). We wore shorts, and had only one day we wore long pants and sleeves. We also only had about 2 hours of rain. It cools off quick, so like other posters said, bring something warm if you are staying out later. We brought a little bit of everything (including winter coats and mittens for the drive down) and will do so again. We have been at this time of year 3 times, and every time we joke that only the Canadians are wearing shorts no matter the weather and the locals are wearing parkas! It's all a matter of perspective I guess - anything above freezing is a bonus for me in the middle of winter!