I'm from Michigan, so I don't normally have to worry about such high temps and low humidity. But I have spent many July's in the desert outside of Phoenix, AZ doing hot weather testing. Basically, outside all day, everyday, in the heat and sun. So if you are from Phoenix, this probably comes second nature to you. Or if you spend alot of time in Vegas, also probably second nature... but this was my lesson...

I didn't think 115 F seemed that bad. Heck - I didn't feel like I was sweating. Until I realized all my sweat evaporated the second it came to the surface of my skin, in an attempt to cool me down. I never got "sweaty". But when I realized I only urinated once during the entire day, I knew I wasn't going to make it much longer. I corrected my fluid intake the second day, but we had some folks on the trip who got sick because they were only drinking when they were thirsty. They were lucky they didn't end up in the hospital.

Yes - I'm probably a wimp Northern, but come on up to the Upper Peninsula of Michigan in Feb sometime. I'm built for the cold.