John-
this might help.
Pretty much a function of the ambient relative humidity
Dew point ...Human perception[6] ...Relative humidity at 32 °C (90 °F)
Over 26 °C Over 80 °F Severely high. Even deadly for asthma related illnesses 73% and higher
24–26 °C 75–80 °F Extremely uncomfortable, fairly oppressive 62–72%
21–24 °C 70–74 °F Very humid, quite uncomfortable 52–61%
18–21 °C 65–69 °F Somewhat uncomfortable for most people at upper edge 44–51%
16–18 °C 60–64 °F OK for most, but all perceive the humidity at upper edge 37–43%
13–16 °C 55–59 °F Comfortable 31–36%
10–12 °C 50–54 °F Very comfortable 26–30%
Under 10 °C Under 50 °F A bit dry for some 25% and lower
