Apparent temperature

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Apparent temperature is the general term for the perceived outdoor temperature, caused by the combined effects of air temperature, relative humidity and wind speed.

  • The heat index and humidex measure the effect of humidity on the perception of temperature. In humid conditions, the air feels hotter than it actually is, because of the reduction in evaporation of perspiration.
  • The wind chill measures the effect of wind speed on the perception of temperature. In windy conditions, the air feels cooler than it actually is, because of the increase in evaporation of perspiration.
  • The Wet Bulb Globe Temperature (WBGT) combines the effects of radiation, humidity, temperature and wind speed on the perception of temperature. It is not often used as the resulting figure is very location specific (e.g.: cloud cover and/or wind shielding).

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