We don't either, Richard. One hunt we were on, was -40 all day long. Taylor, my late hunting partner Brad and I - late special weapon's moose hunt. It was pretty cold.
Got skunked.
Too many main springs were breaking at -30 and -40, so we drew a limit to -20F. Over the years, that climbed and changed to C and now if it's freezing at all, it's too cold.
The old hands just can't take it any more.