Mali dodatak prethodno spomenutom:
THSW INDEX, nije baš lak za računanje ali koga zanima može malo da "progugla"
THSW Index uzima uticaj temperature, vetra, rel. vlažnosti vazduha i sunčevog zračenja.
Neke od formula za računanje subjektivnog osećaja temp. su (AT = apparent temperature):
The formula for the AT is an approximations of the value provided by a mathematical model of heat balance in the human body. It can include the effects of temperature, humidity, wind-speed and radiation. Two forms are given, one including radiation and one without.
Version including the effects of temperature, humidity, and wind:
AT = Ta + 0.33×e − 0.70×ws − 4.00
Version including the effects of temperature, humidity, wind, and radiation:
AT = Ta + 0.348×e − 0.70×ws + 0.70×Q/(ws + 10) − 4.25
where:
Ta = Dry bulb temperature (°C)
e = Water vapor pressure (hPa) [humidity]
ws = Wind speed (m/s) at an elevation of 10 meters
Q = Net radiation absorbed per unit area of body surface (w/m2)
The vapor pressure can be calculated from the temperature and relative humidity using the equation:
e = rh / 100 × 6.105 × exp ( 17.27 × Ta / ( 237.7 + Ta ) )
where: rh = Relative Humidity [%]
Treba napomenuti da mnoge firme imaju "svoj" način računanja "subj. osećaja" i te formule patentiraju i štite (npr. "RealFeel" by AccuWeather...)