Heat Index Chart Printable – The heat index chart shows the perceived temperature in celsius based on actual temperature and relative humidity. The ‘heat index’ is a measure of how the hot weather feels to the body. National weather service heat index chart temperature (ef)relative humidity (%) 80 82 84. It displays a grid with temperature in celsius ranging from 26 to 50 degrees. The heat index is an accurate measure of how hot it really feels when the affects of humidity are. The ‘heat index’ is a measure of how hot weather feels to the body. The heat index (hi) is the temperature the body feels when heat and humidity are combined. This chart is titled national weather service heat index in blue text in the upper left corner.
