Since I have lived in Arlington, it has never been too hot or too cold to ride. I hate the heat (and that’s anything above 80 degrees). but I just make sure to drink more water — before, during, and after. If it’s nt hot, I might not drink at all on my commute, but I amke sure to drink when it’s hot I probabky ride a tad slower, too, but that could be due to more people out on the trails.