Temperature - Humidity Index Table for dairy producers to estimate heat stress for dairy cows.

DEG = degrees. Relative Humidity expressed as %

< 72F = No Stress
72-78 = Mild Stress
78-89 = Severe Stress
89-98 = Very Severe Stress
>98 = Dead Cows

Modified from Dr. Frank Wiersma (1990) Department of Agricultural engineering University of Arizona, Tucson.