Entry from US English dictionary
A quantity expressing the discomfort felt as a result of the combined effects of the temperature and humidity of the air.
- If the air warmed to 95 degrees and the dew point stayed at 71, the relative humidity would be 44% and the heat index would be 101 degrees.
- The first thing I do is fetch ice ($8 for a regular-size bag), a job that is hugely important because the heat index, with the humidity and asphalt, is roughly 174 degrees.
- It will also read temperature, humidity, dew-point, wet bulb temperature, wind chill index, heat index, barometric pressure and altitude.
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