Climbing is easier in the cold - your hands / fingertips don't get as sweaty and adhere better to the rock face. Also, the dawn wall is full in the sun for muc

Climbing is easier in the cold - your hands / fingertips don't get as sweaty and adhere better to the rock face. Also, the dawn wall is full in the sun for much of the day, and the rock can get insanely hot during the summer. They need to climb before dawn on warmer than average days, or they would make no progress whatsoever. .