Went many times in September. I once joked to staff that I can't imagine coming in winter since the water is already so cold. They said it is actually much better because the change from air to water isn't so bad, water won't feel as cold. Yeah, sure ...........
Couple years ago whole family was there for Christmas so we booked it. I was nervous. It was AWESOME! Staff was right. In nice weather took me forever to get in water each time because it felt so cold. But in December I could walk right in, off and on all day. I wouldn't hesitate to do winter trip again (and the price was great!)
The lazy river and pool area are heated and good place to relax and warm up. 85-86 degrees.
Dolphin Lagoon is 80 degrees.
The grand reef water is cold, has to be for the fish. 76-77 degrees.