In my 20s, riding in the high 80s and low 90s was my favorite. Ride hard, drink lots, and be drenched in sweat like you had done twice the work.
As a bike commuter during the winter (converted hard tail mtn bike with slicks, fenders and lights) I was happy at 35*+ and not so much below that due to cold extremities.
Now in my mid 60s, I am finding that those high 80s and low 90s really sap my energy and make riding longer than 1.5 hours a drag. Similarly since I don’t have to bike commute for many years, road biking below 40* is not enjoyable, but mtn biking is because I can warm up faster and stay warmer.
So what temps do you now decide to avoid because it saps your energy and enthusiasm? Providing your age as a data point would help. Inquiring trolls want to know.
P.S. This thread is not intended as a debate of who is more macho, worthy, wimpy or just right, so please don’t go there.