0 to 100 on the Fahrenheit scale is "Really Cold" to "Really Hot".
0 to 100 on the Celsius scale is "Kinda Cold" to "Unsurvivable Hot".
When I say it's "human-centric" I mean that it maps well to the range of human comfort (Celsius is obviously vastly superior in just about every other use).
Maybe it's unsustainable, you can't survive that indefinitely. But you can't survive 0° F indefinitely either, unless we bring protective clothing into the game.
Edit: 100C is boiling point for water - is the ambient temp of the Sauna 100C?
Finnish saunas are kept very dry. Sufficiently dry air makes very hot temperatures bearable because evaporation cooling from sweat gets more effective the dryer the surrounding air is. Water on the other hand makes sweating useless, which is why you can't tolerate water temperatures above body temperature (depending on how much of you is submerged).
1: https://en.wikipedia.org/wiki/Finnish_sauna#Types_of_sauna
Apparently so! TIL.
I'm in the UK we switched to C for temperatures back when I was a kid (I still vaguely remember both been used on weather charts back when they stuck the things on by hand..), 0 is cold, 10C is brisk, 16C is perfect, 20C is warm, 30C is hot, 35C is "kill me now".