It does kinda depend on humidity, fwiw. In New England, the 90’s are hot, unpleasant sticky weather.
I guess it doesn’t happen often, but I saw some upper-90’s temperature in the Portland, Oregon area. It feels relatively mild actually, compared to New England 90’s, I’m pretty sure because it is so dry. The lighter air just carries the heat away, rather than having it stick to you.
I think GP was talking about saunas and not ambient temperature. So 100C not 100F. Still the argument remains the same: Low humidity (and reasonably short durations)
