well, I've been hunting in the shenandoah valley where the only thing that didn't freeze was what was in the cooler, but that was all alcohol anyway. That happened several times during bow and gun season, which is oct-dec, it was a touch cold early in the season. And I've been skiing in WV and CO where the high of the day was 5*F. It's not bad when you're being physical at the same time, and dress properly for it