KrowNB and wing_zealot got it right in their posts. Winter in the north is beautiful and with endless things to do outside. When it's HOT in summer in the south and west, about all you can do is hide inside in blasting air conditioning or you are so miserable. Used to go to the Phoenix test track even in summer and it was horrible just going from an air conditioned vehicle to an air conditioned building. Dry heat not hot? BS!
Hot is hot and over 100 F is just plain hot. Yes, wet heat feels worse at the same temps but rarely does it get much over 100 F in Florida, but you'll almost instantly turn into a ball of sweat when you get out of an air conditioned vehicle or building because of the high humidity. Often, even at 90 to 95 F. An area that's over 85 F is a great place to be from. Far away from, that is!