We have had a mild Winter, long, cool Spring and mild temps since May. Sunday was 89 with 34% humidity- that was FANTASTIC! t has been a bit muggy in the past two weeks but it was somewhat cool with a breeze, so it wasn't bad at all. If this weather would be consistent with the seasons in the future, I might consider staying in WI, but Winter has lost its charm and if I want snow, I would rather go to it and since my knee has made any sports or strenuous activity involving leg strength impossible, skiing is out. Lutsen was the best place I have skied. Seriously cold, but it was a great trip.
I have been in AZ during June-August more than any other time of year and it's doable, but only if the correct precautions are used. Three rafting trips in the canyon- 110+ every day, but we had the cold water in the Colorado River to cool us and we stayed in the shade when we weren't on the rafts. Last time I was in PHX, I was there to buy my cargo van and it was hot, but not terrible. Usually breezy working in the shade wasn't bad at 103°F.
With nothing to do, sitting in the heat is about as bad as I can imagine, especially with high humidity.