"It's not the heat, it's the humidity."

Really, it is true. Not that dry heat can't be debilitating - it sure can be. But when you feel like you're walking through warm wet wool, your perspiration isn't evaporating and therefore you're not cooled by it, and each breath feels like you're taking in more water than air, exhaustion comes pretty quickly.

As an example, in the cool, dry fall I can easily split firewood with an axe for a couple of hours at a time without being overtired. Last weekend I wanted to take down and saw up a couple of small (10" diameter) oak trees at the back of our property. The chain saw is in the shop, so I thought, what the heck, I've got a good sharp axe and a big bow saw, I'll do it the old fashioned way. The temperature was 90-ish and the humdity was hovering around 80%. After 2 hours I felt like I had been at it for more than 8. After 3 hours I had to quit and finish the job the next day.

Frank2135