We have been at all times of the year and have never had the water too cold to swim. We even went to BB one time Christmas week and the life guards all had long sleeved shirts and long pants and had the same thing in January at SSR and the water was fine in the high 70s low 80s. Have never had a cold pool at OKW which is where we stay the most so think you will be just fine as long as you don't expect 90 degrees. There have been times when the air has been cold in Dec, Jan and Feb so when you get out it can be a problem.