I can only speak about temperatures down to about -40.
I have had absolutely no problems what so ever with any Scrap Yard knife at those temperatures. My Dog Father had been used more below freezing than above and it just trucks right along. The res-c is quite nice since it doesn't transfer cold like metal. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /><img src="/ubbthreads/images/graemlins/thumbup.gif" alt="" />
I would say that -40 covers it pretty well. I have been in -40 (no wind) a few times and even -40ish with a stiff wind. The windchill factor was -70 or so. I know how that can make steel like glass. Only thing different is that Im smart enough to not be chopping or cutting anything in that kind of weather.... <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />