> Even heat-adapted people cannot carry out normal outdoor activities past a wet-bulb temperature of 32 °C (90 °F), equivalent to a heat index of 55 °C (131 °F). A reading of 35 °C (95 °F) – equivalent to a heat index of 71 °C (160 °F) – is considered the theoretical human survivability limit for up to six hours of exposure.

--- https://en.wikipedia.org/wiki/Wet-bulb_temperature

$code:
    def get_wet_bulb(Tdry, RH):
        return Tdry * math.atan(0.151977 * math.sqrt(RH + 8.313659)) + 0.00391838 * math.sqrt(RH**3) * math.atan(0.023101 * RH) - math.atan(RH - 1.676331) + math.atan(Tdry + RH) - 4.686035

Wet bulb for 110 °F and 60% relative humidity is $get_wet_bulb(110, 60).

<div>\[
\scriptsize \begin{align*}
T_\mathrm w = T\arctan(0.151977\sqrt{RH + 8.313659})
\\  + 0.00391838\sqrt{RH^3}\arctan(0.023101RH) 
\\  - \arctan(RH - 1.676331)
\\  + \arctan(T + RH)
\\  - 4.686035
\end{align*}
\]</div>

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