Originally Posted by
Chris Pringle
I lived in Phoenix for 14 years and used to MTB after work. One summer evening temperatures reached 117F and I still went for my regular ride. It makes a huge difference when the sun has gone down and with a camelback full of ice and water. People at the office were quite horrified when they learned I was going for a ride. It's amazing how the body adapts with proper training and nutrition.
Back in 2007 we had 23 straight days of 100+ degree temps w/75% humidity. My mileage was 200+ per week during that time period. Commuted and did all of my utilitarian cycling as when it was 75. The main thing was staying hydrated. I had a white helmet, white bandana and wore white 'wicking' t-shirts. If not for such a strong base of mileage there's no way I'd have been able to acclimate to the temps during that stretch.