A cloudy and dry 35F or a sunny 30F is the point of diminishing returns for me. Below that, and the ride becomes more about staying warm and dry than getting a good ride in. If I have to stop for anything like a flat, the ride is essentially over. I try to avoid extended climbing and descending at those temps. Sweat is a killer.
This is why Zwift exists.
Edit:
Just imagine if you train through the cold temps, your fitness will have an edge over the other racers that didn't. That's how I used to justify flogging myself in crap conditions before the advent of indoor riding.
Last edited by Cypress; 01-20-20 at 04:06 PM.