We went on the 12-27-03 Eastern. So we were on CC on January 2 of this year. My wife, who is always cold* was comfortable snorkeling for a couple of hours on CC in a light rain.
The beach did seem to clear out, so some others might have though it was cool, the water was about the same temperature as the air.
*How cold IS my wife you ask? She is famous at her work for sitting outside during lunch hour, on a 100 degree day, in long sleeves, drinking coffee, and having a thermos of hot soup for lunch.