That's too cold for Pcad. If it's too cold for Pcad, it's too cold for anyone.
I rode today but it was 15-20ºF here. I won't ride when it's below low teens. 13ºF has been my coldest ride. Rode for two hours today. Actually the wind made it much worse. How rideable cold temps are has a lot to do with the presence or absence of 25mph wind gusts. We had those here today and it was nasty.