Key idea
When heat index is useful, when WBGT is more relevant, and how to choose the right metric.

Heat index

Heat index combines air temperature and humidity and is useful for general public weather awareness. It assumes shade and light wind.

WBGT

WBGT responds to sun and radiant heat, humidity, and wind. That makes it useful for decisions about outdoor work, sports, and events.

Choosing a metric

Use the measure named by the policy governing your activity. Neither number replaces trained supervision, cooling measures, or attention to symptoms.

Check WBGT for your location

Explore local conditions and forecasts with Klimo WBGT.

Open Klimo WBGT