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To add to this with an article I just found

“The [wet-bulb] temperature reading you get will actually change depending on how humid it is,” says Kristina Dahl, a climate scientist at the Union of Concerned Scientists. “That’s the real purpose, to measure how well we’ll be able to cool ourselves by sweating.”

Source: https://www.theguardian.com/science/2022/jul/31/why-you-need...

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Yes, wet bulb temp is in the context of humidity.

Apparently 95f or 35c is the "limit" for humans - where many people will have health issues if they can't cool off otherwise.

"Health issues" may be under selling it.

https://en.wikipedia.org/wiki/Wet-bulb_temperature

> The theoretical limit to human survival for more than a few hours in the shade, even with unlimited water, is a wet-bulb temperature of 35 °C

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