We went on December 30th. Water is mostly bath warm. I think it was around 65 that day. So, towels and running from the water to wrap towel around ya. Best part, since we went using the early entry, the slides and rides had no line, so we got to do them over and over again, before the crowds came around 11am. Didn't order food, but it did look good. Stayed around 3 hours, then left and cleaned up to go to the parks.
Unless you don't like cooler weather, we're from the North, so for us, any temp over 60, with heated pool, is good for us.