We used to go a lot in Feb and only went to the water parks once. The year we got to the Y&BC and found out Stormalong Bay was closed. DD2 was still very young and started to cry when the cast member checking us in said it was closed. The poor lady was so upset she gave us free passes to the water park.
It was really warm that year, maybe in the high 70s with lots of sun and was plenty fine for swimming. If the weather gets below about 75 I don’t go in the water, spent enough time out in the cold that it is just not fun for me.