I don't mind riding when the temperature falls, but there is always a limit. For the last 30 years or so my sweetie and I have been x-c skiing most weekends, generally in New Hampshire. We've seen temps as low as -30F, never tried skiing in that though. Have skied in -5F many times, even -10F. You learn how to dress. When you've done that enough, biking at 30F doesn't seem so hard. But you do have to dress for it.