There is Heat index or Humidex where relative humidity IS a major factor, but I doubt whether this is a factor for temperatures less than 25C or RH below 40%. Wind chill, which is the problem at temperatures below about 15C and is wind speed related has no factor in the equation accounting for relative humidity. Iwould have though apparent temperature was entirely due to the cooling effect of being blasted with air rather than ant third or fourth order effect due to specific heats of air at different RH.
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