We have the opposite problem here in Central Texas.
We used to have a large in-ground swimming pool that we could only use in the fall and spring. In July and August, when it is over 100 degrees most days, the pool felt like a hot tub. We tried tossing several 50 pound blocks of ice in it, but the pool was too large for the ice to have any measurable effect.
Playing human lobster aint no fun. Give me a coldwater creek any day!