Wet-Bulb Temperature & Heat Stress

Stull's (2011) formula estimates the wet-bulb temperature from temperature and relative humidity (valid for RH 5–99% and −20 to 50 °C). A wet-bulb temperature near 35 °C is the theoretical limit of human survivability; above about 31 °C is extremely dangerous for most people, and 28 °C already makes sustained work unsafe.