You’ve never lived in Arizona, have you? :)
Arizona is a 5-season climate; there are 2 summers. Early summer (May-June, thereabouts) is the “dry heat” that people hear about, and it’s very short-lived. LATE summer, which usually doesn’t end until mid-October, is a whole different ball game, no pun intended.
There is more humidity then, which makes the heat levels a lot more dangerous. Sure, it’s not 90% humidity, but if your temperature is 119 degrees in the shade, it takes very little humidity to make it even more deadly than it already is.
When I lived in Arizona, people visiting from Las Vegas would yelp and complain constantly about “the humidity”, because they have a true dry heat up there. However, even though it’s dry compared to Arizona, it’s still deadly; the NFL would be wise to impose a similar rule for outdoor Raiders games. Extremely high temperatures with low humidity is just as dangerous a combination as moderately high temperatures with high humidity. Just ask any ER doctor who has ever worked in Nevada or Arizona.
That’s why the AZ Cardinals wore their white jerseys at home for the first few games of the season when they played at Sun Devil Stadium. I believe the Raiduhs are trying to get a domed stadium built in LV.
Dude, I live in Yuma! I work outside year round. My knowledge of the Arizona heat is pretty damn intimate.