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. Humidity level of environment will usually affect the evaporation rate, which in turn will affect the heat removing rate and temperature felt by the skin. Heat Index Calculation can be done based on the body temperature and relative humidity using this apparent temperature Calculator.
This Heat Index calculation can be done with temperature of both Celsius and Fahrenheit. Normally, human body loses heat in the form of sweating during hot temperature. Heat index is also referred as 'felt air temperature' or 'apparent temperature'. Heat index changes greatly in sunny and heavily shaded areas due to humidity level of environment.