I don't know about Vegas, but I didn't have AC till I was 19. As I said above, temps were usually 90's with a few days of triple digits. We farmed so we were up and out the door by 5:00, and tried to have all the under the sun work done by 11:00. From 11:00 till 18:00 we tried to work in the shade, after that we finished anything that was directly under the sun.
******** in that weather was an absolute bitch, you just lay in bed sweating till you ****** out. Britain has some of the most mild climate on earth, so I'm gonna stick with weather wusses