100+ degrees 90%+ RH. I ride in places like Savannah, Charleston and Mobile. I do avoid riding during the peak heat of the day, if I do have to ride I plan shady routes, wear light clothing and ride S-L-O-W.

Part of it is acclimation, I have spent much of my life in the deep south so the heat and humidity doesn't bother me as much as someone from a different climate.

Aaron