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@acm_redfox @kimlockhartga The heat index is the apparent temperature compared to dry air. It is above actual temperature, because more humidity makes you warmer. When humidity is low, heat index gets close to actual temperature.

The wet bulb temperature is the temperature your body cannot cool itself to go below. It is below actual temperature, because your sweat cools you. When humidity is high, wet bulb temperature gets close to actual temperature.

When wet bulb temperature goes over normal skin temperature, 32 °C / 90 °F, it's dangerous to stay outside for too long.