Windchill and evaporation

E. Linacre


It is worth noting that though the estimated windchill temperature Twc (Note 3.E) is lower than the air temperature, just as the wetbulb temperature Twb measured by a psychrometer is lower, the reasons are quite different. There is no evaporation involved in estimating windchill, whereas it is evaporation that causes the observed Twb to be less than the air temperature. On the other hand, wind speed, which affects Twc, plays no part in determining Twb.