Be sure to enter your numbers in the correct boxes, either Celsius or Fahrenheit. The apparent temperature is the. The above is slightly prettified from the original formula, but is accurate to 0.03 °C, which should be accurate enough, considering the formula is based on subjective impressions of heat. The heat index (HI) is an index that combines air temperature and relative humidity, in shaded areas, to posit a human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade. 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Second, the formula that the NWS uses for its Heat Index calculations is a simplification of Steadman's work assuming things like a constant wind speed, a person of a certain height, etc. When the temperature is 30 °C (86 °F) and the dew point is 15 °C (59 °F), the humidex is 34. Now you know how hot it … combined index of heat and humidity. A heat index temperature of 32°C holds implied relative humidity of 38%. c8 = 8.5282 x 10−4 T = Temperature in ∘F To do this, check out the temperature conversion formula at: tempConvert.php. Therefore, the heat index is 1410.25 Fahrenheit. Notice that the formula stops working below ~26 °C and ~40 %. You would then calculate: 36 - 4 = 32 and then add 32 and 32 to get 64 F. Bring a sweater on your trip but not a big coat. The error (mean absolute deviation) of the Fahrenheit heuristic to the average model was about 1.6 Celsius degrees. B2 = Humidity. HI is the heat index expressed as an apparent temperature in degrees F. If the RH is less than 13% and the temperature is between 80 and 112 degrees F, then the following adjustment is subtracted from HI : ADJUSTMENT = [ (13-RH)/4]*SQRT { [17-ABS (T-95. Example 2 Determine the heat index for the relative humidity of 86% and the temperature of 85oC. The humidity table is immediately below this and the dewpoint table is below it. From the user, we are given an air temperature and a relative humidity . The formula for the approximation is shown at the end of this document. Formula Or Equation? This heat index has an implied humidity of 20%. Heat Index Calculation Excel Post by nossis » Sat Mar 22, 2014 10:52 pm Here is an Excel formula I developed to calculate the heat index using Temp and Humidity and humidity (the reverse of the “wind chill factor”). For example, an air temperature of 83°F with a relative humidity of 70% would result in an estimated 88°F perceived temperature. 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