[steve86]

Standard lapse rate is 2 degrees Celsius per 1000 feet. You generally notice the wind chill more than the actual temperature change.

[JRandomFreeper]

Boiling point of water is 1 degree F less per 500 ft. And that makes a difference, too. Sweat evaporates quicker. And I always sweated when I climbed.

BTW, I learned that little fact as a cook, my last enlistment when I wound up on a short TDY at 8000ft ASL and tried to bake bread.

/johnny