Wet Bulb Temperature - What Is It?

Wet bulb temperature is the lowest temperature to which an object can cool down when moisture evaporates from it. Once wet bulb temperature exceeds 35 degrees celsius, no amount of sweating or other adaptive behavior is enough to lower your body to a safe operating temperature. The problem is that at a wet bulb temperature of about 97 degrees fahrenheit, your sweat stops evaporating, and you can't cool yourself. And this kills you really, really fast.