I used to live in the desert, contrary to all the jokes, the dry does make a big difference. When in 115 degree heat your nose feels the heat as you inhale but because of the dry you stay dry, the sweat just never has time to accumulate. I now live in Iowa, when its more than 75 degrees the humidity climbs to the higher percentages and by the time you hit the mid 80s i'm ready to melt and not too much longer everything I'm wearing is sopping wet. Sometimes I'm so tempted to go back to the desert. I had thyroid cancer which makes temp changes rough on me, and I've always had trouble with humidity. I lived in Bullhead City AZ and it is usually the hot spot of the nation or maybe a degree lower. Big thing to remember, bring LOTS of water with you.