Just finished a brutal 2.5 hour ride today. The heat index is 99F here. My Garmin edge 500 was reading 108F, granted that is not accurate since it is in direct sunlight, but them so am I.

I went through 4 full bottles of water and ice, stopping for about 5 minutes once for a fill up.

I have got to start riding earlier I guess, but I sure hate to get up so early.