We have been at WDW during February for the past three years. One year it was gorgeous - light jacket in the a.m., shorts and tank tops in the afternoons. Another year it was a heat wave - almost 100 for much of the trip. Last year it was freezing - we needed jackets, hats and gloves even during the afternoons. And on all three of those trips we swam in the pools. The kicker is if it's cool, you'll be fine in the water, but COLD when you get out. We brought our kids' bathrobes and brought them down to the pool with us for when they got out and dried off. Worked like a charm!