I'll leave Aquatica in the 40's to 60's to you guys,I went to Aquatica this year in what must have been one of the hottest days of the year,my cars thermometer read 103,the weather channel said the heat indexes were in the 115-120 range and the thermometer in their wavepool had 100 most of the day,with that heat and very few clouds it was probably as perfect waterpark weather as it gets.The coldest I've ever been to a waterpark was a few years ago to Blizzard Beach,it was probably in the 50's in the morning and probably got into the low 70's,I was fine if I was in the sun but in the shade I was pretty cold,I am from Florida though,a day like that is probably great for people from colder climates.