Best temparature WC

I know that here in Indy it hasnt snowed that bad like in New York, but my question is what is the lowest temperature anybody has worked outdoors.

Several years ago we thawed out a truck scale at a local coal mine when it was 15 Below zero! Wind chill that day was 50 below. They have changed the charts since then so the w/c would not be that cold today.

Dave Olson