[wolf550e]

Your arithmetic / unit conversion doesn't work. Change of 3.5°F is same as change of 1.94°C, not 1.2°C. Change of 28°F is 15.5°C. 37.7 - 22.2 != 9.6.

(Water freezing to boiling is 100 degrees in C and 180 degrees in F).

[dredmorbius]

Point. I'd taken values from the linked source, which appears to be in error. The Celsius values don't correspond to F2C conversion, as you note.

Though my final at-elevation result remains unchanged: 72°F / 22.2°C, a 15.5 degC drop.

https://treelinebackpacker.com/2013/05/06/calculate-temperat...