The heat index (HI) or apparent temperature or humiture or humidex is an index that combines air temperature and relative humidity. Enter the temperature in degrees Fahrenheit and relative humidity (RH) in percent (without the % sign), or the Dew Point (T dp).Then click on the Calculate HI to compute the heat index (HI). This Heat Index chart uses relative humidity and air temperature in fahrenheit to … This calculator uses the following basic formula to calculate the heat index: HI (Heat Index, °F) = C 1 + C 2 T + C 3 RH + C 4 T RH + C 5 T 2 + C 6 RH 2 + C 7 T 2 RH + C 8 T RH 2 + C 9 T 2 RH 2 + CF. The Heat Index (or apparent temperature) is the result of extensive biometeorological studies. Each of these parameters can be described by an equation but they are given assumed magnitudes (in parentheses) in order to The parameters involved in its calculation are shown below (from Steadman, 1979). Heat Index Calculator. By OSAA policy, schools are required to check their practice location's heat index through the OSAA Heat Index Calculator, no other site. Heat Index Calculator The Heat index is calculated by using the actual temperature and relative humidity level to determine the human-perceived equivalent temperature (how hot it feels). 70°F 21°C 75°F 24°C 80°F 26°C 85°F 29°C 90°F 32°C 95°F 35°C 100°F 38°C 105°F 41°C 110°F Heat index is broken down into the following four levels: Heat Index is the measure of temperature felt by the human skin when the air temperature is combined with the relative humidity, instead of actual temperature due to the humidity level. Choose the appropriate calculator and enter the values. Heat Index Formula. Then click calculate. This allows the OSAA Heat Index Calculator to use data for geographically specific results and up-to-date information. person_outlineTimurschedule 2016-07-21 22:08:23. Heat Index Calculation. The 'Heat Index' is a measure of how hot the weather 'feels' to the body. While the all time high temperature in San Juan, PR soared to 98F on October 9th, 1981, Heat Index values across the Northeastern Caribbean often exceed 100 degrees on any given day. Heat Index Calculations. The Heat Index is a measure of how hot it really feels when factoring in the relative humidity at a given location. The Heat Index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature. Air Temp. This calculator calculates heat index (apparent temperature), which is used by US meteorologists to determine the human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade. Strong winds, particularly with hot, dry air can be extremely hazardous. A surface, such as the skin on a person's body, loses heat through conduction, convection, and radiation. Calculation of Heat Index The Heat Index (HI) is an index that combines air temperature and relative humidity to determine the human-perceived equivalent temperature (i.e., how hot it feels). Although conduction and radiation are relevant to heat transfer, wind chill temperature is mostly a result of convection. Heat Index. meteorological calculator, weather calculator. The heat index is categorized and suggested practice modifications are provided. The formula for approximating the heat index in degrees Fahrenheit, to within ±1.3 °F is presented below. Keep in mind, this heat index chart was devised for shady, light wind conditions, so exposure to full sun can increase values by up to 15°F. Refer to the Heat Index Calculator for further detail. To find the Heat Index temperature, look at the Heat Index Chart above or check our Heat Index Calculator.As an example, if the air temperature is 96°F and the relative humidity is 65%, the heat index--how hot it feels--is 121°F. 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