The consensus seems to be [wet-bulb measurement of 35°c](https://en.m.wikipedia.org/wiki/Wet-bulb_temperature#:~:text=Study%20results%20indicate%20that%20limiting,limit%20of%2035%20%C2%B) (see the climate change section)
122f is much higher than that, but I’m not sure how or where it was measured. I suspect people survive 50c by limiting exposure and staying inside cooled buildings. I hope the power grid keeps working…
If you’d like to read an example of a fictional extreme heat wave, allow me to suggest [Ministry for the Future](https://en.m.wikipedia.org/wiki/The_Ministry_for_the_Future) which is pretty gut wrenching.
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