AccuWeather created a unified and proprietary apparent temperature system known as "The AccuWeather Exclusive RealFeel Temperature" and has used the quantity in its forecasts and observations. The formula for calculating this value incorporates the effects of temperature, wind, humidity, sunshine intensity, cloudiness, precipitation, and elevation on the human body, similar to the rarely used (but public domain) wet-bulb globe temperature. AccuWeather has been granted a United States patent on The RealFeel Temperature,[17] but the formula is a trade secret and has not been reviewed by other meteorological authorities.