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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.
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.
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.