I delivered the Daily News Miner in 1955 and it seems that the lowest temp was -56deg. That was on Ladd AFB.
It was colder then!
Art, I will always remember that day delivering the papers in that cold. I did both the officers and enlisted men's trailer parks on base. I was 12yrs old and had an old Army surplus parka that was down to my ankles, long johns, and Sears Roebuck jeans. I needed to pee and my business wouldn't make it all the way out of all my clothes. Needless to say I finished my deliveries with cold and frozen jeans.