BTW, I have several coworkers who rode into work this summer with long sleeve shirts and long pants, even on the hottest summer days. I could tell though their commute was less than 5 miles - heck probably less than 2 miles.

I wasn't riding fast during the summer (still don't ride that fast) but 10+ miles in the 90+ F heat and humidity will wring buckets of sweat out of your pores, even if you're riding almost as slow as a jogger.