I spent a good 7 months working near Harlingen, TX.
The heat and humidity was just unrelenting, It was f**king awful. I could work outside and be fine but It pissed me off that I couldn't just enjoy being alive outside. Playing golf was terrible there, I only did it because I was stubborn and wanted to play golf. I couldn't just sit on the deck and enjoy the day, it was miserable.
I'll be surprised if I choose to retire in a warm state.