Well, I managed to get out in the (to us PNW'ers) extreme cold of about 27 degrees Fahrenheit about 9 or ten days ago. I don't think I went out at all when it was actually snowing, but I did get out when there were great chunks of ice still on the road, and snow/ice mixed on the trail.

I actually found it to be quite refreshing! Slow, because parts of the trail were quite slick, but I didn't have too many problems getting out there on the mountain bike. I don't know if I could handle any - temps, though.
Rain is not a deterrent here in the Pacific Northwest. If it were, virtually no one would ride a bike.

On the other hand, my extreme high temperature is probably the upper 80's. I get migraines from excessive heat, so I am quite leery of getting out there in the midday sun.

East Hill