It's not going to make it to 60F here in Seattle today. I was talking to the woman who works in my office building as part of the maintenance staff about what's happening in the part of Mexico where most of her family live. She said it was over 50C there, and even the people who live there and are used to heat were too hot to do anything except lie around trying to cool off. I doubt a Thunderbird would like that kind of heat very much. The Thunderbirds that live in the Basement of Blasphemy and Bad Ideas have no issues. It's never much above 72F there and never much below about 65F there, being below grade and all. Plus the humidity hardly seems to change, either.