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 / RISK | IMPACTS | ACTIONS |
---|---|---|
80-85 F / Low | Body stressed after 45 minutes | Take at least 15 minutes of breaks each hour if working or exercising in direct sunlight. Stay hydrated. |
85-88 F / Moderate | Body 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 / High | Body 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 / Extreme | Body 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. |
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