Soaring temperatures and raging fires: Europe faces its second heat wave in a week

I feel that at this point, we should also be talking about Wet Bulb Temperature (calculator) - something I came across just a few years ago.

Apparently...

“critical” WBT (Wet Bulb Temperatures) for humans, the point at which a healthy person could survive for only six hours. This is usually considered to be 35C (95 F), approximately equivalent to an air temperature of 40C (104 F) with a relative humidity of 75% : source

Humans usually regulate their internal body temperature by sweating, but above the wet-bulb temperature, we can no longer cool down this way, leading our body temperature to rise steadily. ... our body’s core can rise beyond the survivable range and organs can start failing. (same source)