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Use this Heat Index Calculator to calculate the heat index (HI) based on air temperature (T) and relative humidity (RH). How to use this calculator. Choose the temperature unit between degrees Fahrenheit, degrees Celsius, or Kelvin. Enter the air temperature.
This calculator estimates heat index temperature felt by the human body based on the actual measured air temperature together with humidity level or dew point.
12 Μαΐ 2022 · In practice, the simple formula is computed first and the result averaged with the temperature. If this heat index value is 80 degrees F or higher, the full regression equation along with any adjustment as described above is applied.
The formula below approximates the heat index in degrees Fahrenheit, to within ±1.3 °F (0.7 °C). It is the result of a multivariate fit (temperature equal to or greater than 80 °F (27 °C) and relative humidity equal to or greater than 40%) to a model of the human body.
25 Αυγ 2023 · Choose the appropriate calculator and enter the values. Then click "Calculate". * Please note: The Heat Index calculation may produce meaningless results for temperatures and dew points outside of the range depicted on the Heat Index Chart linked below.
The equation for HI above with the appropriate adjustment is used to compute a maximum heat index using the forecast maximum temperature and an estimated 00 UTC dew point temperature at each forecast point location for each forecast projection day.
