Temperature (F) versus Relative Humidity (%)
°F  90% 80% 70% 60% 50% 40% 30% 20% 10%
65 65.6 64.7 63.8 62.8 61.9 60.9 60. 59.1 58.1
70 71.6 70.7 69.8 68.8 67.9 66.9 66. 65.1 64.1
75 79.7 76.7 75.8 74.8 73.9 72.9 72. 71.1 70.1
80 88.2 85.9 84.2 82.8 81.6 80.4 79. 77.4 76.1
85 101.4 97. 93.3 90.3 87.7 85.5 83.5 81.6 79.6
90 119.3 112 105.8 100.5 96.1 92.3 89.2 86.5 84.2
95 141.8 131.1 121.7 113.6 106.7 100.9 96.1 92.2 89.2
100 168.7 154. 140.9 129.5 119.6 111.2 104.2 98.7 94.4
105 200 180.7 163.4 148.1 134.7 123.2 113.6 105.8 100.
110 235. 211.2 189.1 169.4 151.9 136.8 124.1 113.7 105.8
115 275.3 245.4 218 193.3 171.3 152.1 135.8 122.3 111.9
120 319.1 283.1 250. 219.9 192.9 169.1 148.7 131.6 118.2

    HI      Possible Heat Disorder:
80F - 90F     Fatigue possible with prolonged exposure and physical activity.
90F - 105F      Sunstroke, heat cramps and heat exhaustion possible.
105F - 130F   Sunstroke, heat cramps, and heat exhaustion likely, and heat stroke possible.
130F or greater    Heat stroke highly likely with continued exposure.