I remember visiting my in-laws in Phoenix, AZ in July and going to bed in tears because it didn't cool down at night. All day long, I'd suffered from the intense heat and longed for evening. But when evening came, it simply dropped into the 90's. I had lived in other warm places in summer time - Greece, southern Spain, South of France, but nothing compared with the intensity of Arizona summer heat. My brother-in-law used to work construction in college vacations and would cook his lunch, literally, on the top of his truck simply by letting the sun do its work.