I am in the south: Oklahoma. At least, it's definitely one of the oven spots in the US.

As for tolerating temperature variances, you could be right. I'm not going to know because I was very, very sick about 3 years ago and one of the side effects is that my thermostat is off. I tend to get hot really easily. For months I had huge chills followed by soaking sweats, so things have calmed down considerably. But about once a day at least I just get really, really hot and I don't think this is going to go away. Apparently this is fairly common when your system is hit really hard. It's a small price to pay: I'm alive.