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What is heat index? How hot does it really feel outside? Use this chart to find out
The chart is a grid where you can find ... temperature and either the relative humidity or the dew point to calculate the heat index temperature.
What is the heat index, and how does it vary from air temperature?
In order to calculate the heat index, you need to compare the dew point (or relative humidity) values and the actual air ...
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Dew point
The dew point is the temperature the air needs to be cooled to in order to achieve a relative humidity (RH) of 100%. The higher the dew point rises, the greater the amount of moisture in the air.