heat index

heat index
(HI or HX)
   a measure of the combined effect of heat and humidity on the human body. U.S. meteorologists compute the index from the temperature T (in °F) and the relative humidity H (as a fraction; that is, H = 0.65 if the relative humidity is 65%). The formula used is
   HI = -42.379 + 2.04901523 T + 1014.333127 H - 22.475541 TH - .00683783 T2 - 548.1717 H2 + 0.122874 T2H + 8.5282 TH2 - 0.0199 T2H2.

Dictionary of units of measurement. 2015.

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