The article mentions the "wetbulb" effect and that it stops at 95F. Is this temperature relative to the surrounding humidity? Because much of the U.S. South sits above that for the summer months.
> The wetbulb temperature includes the cooling effect of water evaporating from the thermometer, and so is normally much lower than the normal (“drybulb”) temperature reported in weather forecasts.
With 100% humidity, the air temp and the wetbulb temp are the same. At lower humidity levels, they diverge.
