The Feels Like temperature is a combination of Heat Index when it is hot outside, and Wind Chill when it is cold outside.

Wind Chill temperature is defined by the National Weather Service for temperatures at or below 40 °F and wind speeds above mph. Heat Index is not valid see more calculated below 80 degF. Feb 02,  · For measuring the “feels like temperature”, meteorologists use something called the Heat Index. The heat index (HI) is an index that combines air temperature and dew point (relative humidity) to determine the human-perceived equivalent temperature. At 85 degrees Fahrenheit with 10% humidity, the temperature feels closer to 79 degrees, but Estimated Reading Time: 6 mins.