Just gaining a thousand or two feet altitude usually makes the air considerably cooler. But the sun hits you harder. Surprising the changes! Go for a biplane ride someday. Not hugely expensive, except maybe getting to where the biplane is available. There's several Stearmans in driving distance about my area. And it's likely a milsurp, so....
Here you go! There's even a book called the Cannibal Queen which I read some time back:
http://www.biplaneridesoverphiladelphia.com/