Diane & I are members of that fraternity of those who have spent a few winters in interior Alaska.  Up there 50 degrees below zero doesn’t need any qualifying statements.  I think that most of us from that group wonder about the validity of the wind chill factor (WCF).  At 40° F degrees with a 15 mph wind the wind chill factor is supposed to be 31° F.  Does water freeze at that WCF?
        I imagine that the WCF was invented by Chicago TV weathermen to gain sympathy for their reg...