My last hunt day was spent at 11,500 feet elevation, traversing up and down and around at that altitude +/- 1,500 feet, in 14 degree temperatures and winds that were gusting to about 40 mph, and moderate snow falling (blowing sideways, actually).   In addition, I was carrying gear that weighed roughly 35 pounds.  This day went from 6:30 AM to 3:00 PM.  Statistically, a hunter has about a 17% chance of his/her hunt being successful.