If the forecast is for unseasonably cold temps, they will close the water parks. However, temps fluctuate quite a bit in FL, so they are, generally open every day (except when they are in the seasonal refurbs). We've gone in mid-December for the last 3 years and temps have always been in the mid-70's-80's at least during the weeks we've been there. We've also been there in Feb. when the temps dipped into the 40's-50's. You just never know!