Yeah, and then you have altitude. Our trip was mainly in June, not July-August! I expected heat in Kansas or Iowa but was not expecting it in the Dakotas and Wyoming. Finally, Colorado camping at 9K ft was cool! 😎
Drove down to Phoenix on Thursday to pick up Chris from Sky Harbor Airport. High temp on the truck trip computer was 112F on Phoenix highways. The high in Prescott was 85F (low 58F). Our home is at 5400 FT. That's a 27-degree difference with 4300 ft change in elevation.
In Arizona you can drive a couple hours and change your weather which doesn't work in the Midwest!