WetBulb Globe Temperature

The WetBulb Globe Temperature (WBGT) is a measure of the heat stress in direct sunlight, which takes into account: temperature, humidity, wind speed, sun angle and cloud cover (solar radiation).

This differs from the heat index, which takes into consideration temperature and humidity and is calculated for shady areas.

🥵 Current WetBulb Globe Temperature

WBGT / RISKIMPACTSACTIONS
80-85 F / LowBody stressed after 45 minutesTake at least 15 minutes of breaks each hour if working or exercising in direct sunlight.
Stay hydrated.
85-88 F / ModerateBody stressed after 30 minutes.
HEAT CRAMPS likely (painful contraction of
muscles, weakness)
Take at least 30 minutes of breaks each hour if working or exercising in direct sunlight. Drink ½ to 1 quart of water per hour.
88-90 F / HighBody stressed after 20 minutes.
HEAT EXHAUSTION likely (dizziness, nausea, vomiting, headache, fainting, disorientation, weakness)
Take at least 40 minutes of breaks each hour if working or exercising in direct sunlight. Reduce work, exercise intensity.
Drink up to 1 quart of water per hour.
> 90 F / ExtremeBody stressed after 15 minutes.
HEAT STROKE likely (extremely high body temp, confusion, convulsions, unconsciousness, death)
Take at least 45 minutes of breaks each hour if working or exercising in direct sunlight.
Suspend all strenuous outdoor activities.
Drink at least 1 quart of water per hour.
Adapted from U.S Army and OSHA guidelines and recommendations

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