That said, water rides pose an issue for visitors. I wouldn't go on any ride (or to any show) that might get you wet with temperatures under 60s, unless you were planning to change into dry clothes soon after. And I wouldn't go on a wet ride with temps below the 50s under any circumstances. The time it'd take to get to a place to change would be too long to avoid potential drop in body temperature.
Last year we went to Dollywood before Christmas, and one day the high temperature was 25. On that day, there were very few rides running. They couldn't run the metal rides below 40.