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heat in·dex

/hēt ˈinˌdeks/

noun
- 1. a measure indicating the level of discomfort the average person is thought to experience as a result of the combined effects of the temperature and humidity of the air.
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Heat index
Temperature index that accounts for the effects of humidity
The heat index (HI) is an index that combines air temperature and relative humidity, in shaded areas, to posit a human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade. For example, when the temperature is 32 °C (90 °F) with 70% relative humidity, the heat index is 41 °C (106 °F) (see table below). Wikipedia
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