I'm sorry, 115 is 115. Or 100 is 100 for that matter. No temperatures that any human being should be outside in, let alone exerting themselves in. Humidity is irrelevant. I don't like humidity, either, but, I prefer a more moderate temperature, short bouts of high humidity, a couple of heat waves, and change.
Mostly, I don't have to plan my riding around the temperature, only the chance of rain.
In the winter, I just put my wool on and get outside to snow shoe or x country ski! Again, we don't have the extreme humidity for 3 months, below zero temps for months, or many days above 90 degrees. No tornadoes, either. Yes, the weather here is changeable and weird at times, but that's what I like. It grates on my nerves to hear people complaining about the weather, as most New Englanders seem to do.
Hey, it's just my opinion, but then, I was one who got SAD from endless days of eternal sunshine and unbearable high temperatures.