You're bringing back memories for me, but not really good ones.
I lived south of the Rub' al Khali for while. We would get 40°F temperature swings day/night through the summer. It would cool all the way down to 85~90°F most nights.
That’s the real desert. That’s the kind of place I think about during our summers to remember it could be worse. Probably not much in the way of AC to find out there either.