Calculate WBGT

The Wet Bulb Globe Temperature (WBGT) is a heat index that provides a more complete picture of the heat stress on the human body than a standard air temperature measurement. The WBGT is often used to better assess the risks of working or exercising in warm environments. The index combines four key environmental factors that determine how the body experiences and can dissipate heat: temperature, humidity, wind speed, and solar radiation.

Select the wind speed on the Beaufort scale. Even though the WBGT is calculated with wind speeds in m/s, the actual value is often varying and therefore just a snapshot value. The Beaufort scale is based on a 10 minute average of the wind speed at 10 meters above the ground, giving it a somewhat more reliable value. It is often shown in weather forecasts and reports.

The solar radiation is measured in W/m² and is an indication of the amount of direct radiation received from the sun. For well covered areas like under canopies, the value can go as low as 150. In full sun and with clear weather conditions at sea level, 800 is usually a good value. At higher altitudes it can reach even higher values. It should not be confused with 'sun force' values given in some weather forecasts, since this also takes UV radiation into account.