The attic gets very hot in the summer, but I doubt if it ever freezes up there. It rarely freezes, even outside. Perhaps three times a year the temperature dips below 32 for a few hours outside. In the attic it's probably several degrees warmer.

Last year we actually did get snow that stuck. The temperature dropped so fast that between the time I left for work when it was in the 50s and when I got home, a couple of the plants on the deck were frozen. But that's incredibly rare.

I agree the heat in the attic isn't ideal, but there's just not that much storage space available in the house.