Yep, tomorrow will be a challenge. Wednesday wasn't a problem at -2F, since there wasn't much wind. Tomorrow is forecast to be -15F, with windchills of -30F. I'm not sure I can handle that.
It's to my advantage that I'll have a tailwind for the 8.5 mile ride in. I may wimp out and take the bus home, rather than face headwinds all the way home, when it will still be about -5F.