The Australian Apparent Temperature (AT) calculator computes the apparent temperature (AT) based on the dry ambient temperature (Ta), the relative humidity (rh) and the wind speed at ten meters (ws).
INSTRUCTIONS: Choose units and enter the following:
Apparent Temperature (AT): The calculator returns the apparent temperature in degrees Celsius. However, this can be automatically converted to compatible units via the pull-down menu.
Theis a type of heat index that was used by the Australian Bureau of Meteorology. It is based on a mathematical model published by Robert G. Steadman in 1994.1 It can account for the impacts of temperature, humidity, wind-speed and radiation on the heat balance of the human body. Two forms of the model are available, one including radiation and one without. This algorithm uses the non-radiation version.2
This version of thedoes not account for solar radiance. As such, AT is calculated as:
AT = Ta + 0.33•ρ − 0.70•ws − 4.00
ρ = rh • 6.105 • e(17.27*Ta/(237.7+Ta))
1.Steadman, R. G. (1994). Norms of apparent temperature in Australia. Aust. Met. Mag, 43, 1-16.
2. Thermal Comfort observations. (n.d.). Retrieved May 20, 2016, from http://www.bom.gov.au/info/thermal_stress/