This question is inspired by the book Minus 148 Degrees, which is a true story about a group of mountaineers that got stuck at a high elevation on Denali during a storm and survived 6 days in what is described as "-148F with wind chill". I am told the winds attained speeds in excess of 150mph.
I have made a spreadsheet using the modern wind chill formula to make some estimates about the base temperature, but I understand that the way wind chill is estimated has changed over time and would not have been the same when the book was written and originally published in the late 1960's.
What would be the likely candidate(s) method used at that time to estimate the -148F wind chill temperature?
The wind chill calculator here includes a "pre-2001" formula, but that formula seems broken for the range we are looking at. Putting in a higher speed (ie: going from 150 to 160) produces a warmer wind-chill, so I don't think we can trust that, so I doubt such a formula would have been used. However, that formula would suggest -122F @ 150mph = -148F wind-chill, which does not seem right - planet record cold in Antarctic winter is only a little colder than that. So I'm skeptical of this "pre-2001 formula" as being the method used to determine the -148F estimate.