Enter air temperature
( Tair )
and Dew Point temperature ( Tdp
) in degrees. Click Calculate HI
to compute heat index
( HI) and
Relative Humidity ( RH ).
What Is Heat Index?
Heat index (HI) is sometimes referred to as the "apparent Temperature". The HI, given in
�F, is a measure of how hot it feels when relative humidity (RH) is added to the actual air temperature.
The following equation approximates the heat index. There are many assumptions made to produce this, far too many to list here. The equation was obtained by multiple regression analysis and there is a ±1.3 degree °F error.
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