I'm glad for this thread!
Canon 300D plus 20/2.8, stitched.
We climbed a mountain called East Peak. The temp did not go above -20C/0F all day, and there were gale-force winds at the summit. My gear functioned flawlessly.
El Remate, Guatemala. 40C plus super high humidity. 300D plus Tamron 17-50
Florence, Italy. 400D, Sigma 10-20/4-5.6
Canon 300D, Canon 20/2.8, and a drugstore tripod.