Well, I guess I should throw in my 2 cents. I lived in Yuma, AZ from 1953 to 1980. We didn't had air conditioning until 1973. I remember one day in June when the thermometer in our back yard read 135 F. We moved to Flagstaff, AZ for a few years, and then lived in Alaska from 1986 to 2010. In Alaska my job placed me outdoors almost all year long. I recall working a 5 hour stretch outdoors on the haul road to Prudhoe Bay where the temperatures were hovering at -45 F. The coldest temperture I ever recall being out in was -70 F, but all I did outside was walk between a couple of buildings. Now I'm retired and living on the gulf coast of Florida where today's high was 83 F and if I get to sweaty, I can always jump in the pool.