warm spots

If you read enough Louis L'Amour as a kid, you know that camping on the side of the valley instead of at the bottom is warmer. Today I learned that the same holds true with little hills in Saguaro National Park. I was hiking just after sunset, and I managed to get a little chilly in the gullies, but I warmed up again when I got onto those little hills. So there you go: heat rises, and it makes a difference.