It is easy to understand if airheads are staying off the road. In hot temps and no cooling system other than passive convection, it doesn't take long at lights and jams to cook their oil, get vapor lock and/or pre-ignition problems. They are smart to go around in their a/c cages.......wimps.
We had a couple weeks of temps over 100 here long before the weatherman went all crazy about the current midwest heat wave. I can tell you, when it's 100 to 105 or more, and the sun is baking the road surface even hotter, any long rides will really fatigue you. Yesterday I did a hundred miler down to a little border town and back, just for fun. Not too bad, this week it's cooled off to a mere 98 or so.
As for the border town, all I can say is, if ever a town didn't have a reason to live, that's the place.
I spent last week in Kansas city. I saw a number of bikes on the road, but I would not have wanted to be one of them. It was way too hot for this old man. I'm happy to be back in so Cal with temps in the high 70's!
I'm not sure where I fall into this. Given my druthers, I'd just as soon not ride when the heat index is 110+ but then I just rode 456 miles with the heat index sitting on 115 degrees for most of the trip. I guess that means I'll do it if I gotta, but I don't gota very often.
Heat is no real problem for me as long as I am moving. Now sitting still on a city street between traffic - ahhhhh - no thanks.
Heat has not stopped me from riding on a regular basis - my work commute daily just over 80 miles - except for the 10 - 15 straight days where temps were above 110° and as high as 118°. I did wus out on those days.
The bikes were made to roll - the kickstand was just an after thought.
Here in South Georgia, it's not the heat, it's the humidity. Actually, the heat is pretty **** unbearable too. Nevertheless, I would rather ride to work than drive. Still, it sucks to walk outside and immediately start to sweat at 6:15am.