Apparent Temperature
Calculator

Apparent temperature is a calculated estimate of how hot or cold conditions actually feel to a person, factoring in humidity, wind, and sometimes radiation, rather than just the thermometer's air temperature reading. It's meant to reflect real perceived comfort, not the literal temperature.

Apparent temperature is often a unifying model that behaves like heat index in hot, humid conditions and like wind chill in cold, windy conditions, sometimes calculated with one formula (such as the Australian Bureau of Meteorology's apparent temperature model) that spans both regimes rather than switching between two separate formulas.

Several distinct formulas exist (the U.S. heat index and wind chill, the Australian apparent temperature model, Canada's humidex, and others), each with different underlying assumptions and input variables, so the same raw weather conditions can legitimately produce different reported 'feels like' values.

Some apparent temperature models include an adjustment for solar radiation exposure, producing a noticeably higher feels-like value in direct sun versus shade for otherwise identical air temperature, humidity and wind; most standard published formulas assume typical clothing and don't adjust for what a person is actually wearing.

Wind continues to affect evaporative and convective cooling from skin above freezing, just less dramatically than in cold conditions; some apparent temperature formulas include a modest wind adjustment even in warm, humid weather to reflect this ongoing effect.