About WBGT (Wet Bulb Globe Temperature)

All about Wet Bulb Globe Temperature

What is Wet Bulb Globe Temperature?

Wet Bulb Globe Temperature (WBGT) is an environmental index representing
temperature, humidity and radiation_*1
as major factors affecting human heat balance_*2.
It has been specified as a heat illness risk on the Japanese Ministry of the Environment’s heat illness prevention website since 2006.
WBGT is calculated from dry bulb temperature, wet bulb temperature and globe temperature.

Details about WBGT observations (in Japanese).

*1    Radiation heat comes from the ground, buildings, people and other sources. Hotter bodies emit larger amounts.

*2    Wind also affects human heat balance.

Find out more about WBGT.

How much do you know about WBGT?
Check out your local WBGT.

Preventing heat illness

Heat illness symptoms:

First Aid in heat illness (in Japanese).