The thread may have been titles Winter clothing guide but it could have been All Season clothing guide. Slvoid went up to 115 - 130 + degrees. I worked on Death Valley - The Hot Ride several years ago. In mid
August. The ride started at 7PM after full dark and the temperature was 117 degrees. It dropped to 98 degrees by sunrise the next morning when we had just sagged the last rider off of the 100 mile ride. Half the people did not finish. Every one was fit enough for normal temperatures but most had not specifically adapted their bodies for the heat. I was only riding the 19 miles to Badwater and had to quit at 12 miles.
In deep mining operations the death rate for heavy exercise jumped when the wet bulb temp went over 83 degrees. If it is humid and hot slow way down or just stop. If you must bike hard during extreme heat conditions have a support crew that stuffs terrycloth covered bags of ice under your jersey. With spring and summer coming it is something to think about.