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The Heat Index: Ambient temperature is not the only factor that plays a role in creating the potential for heat
injuries, humidity is also important. Since our bodies rely on the evaporation of sweat as a major method of
cooling, high humidity reduces our ability to cool the body, increasing the risk of heat illnesses. The Heat
Index shows the relative effects of temperature and humidity (see Table 9.5).
The Heat Index
Environmental Temperature Fº (Cº)
70º (21) 75º(24) 80º(27) 85º(29) 90º(32) 95º(35) 100º(38) 105º(41) 110º(43) 115º(46) 120º(49)
Relative
Humidity
Apparent Temperature Fº (Cº)
0%
64º(18) 69º(20) 73º(23) 78º(26) 83º(28) 87º(31) 91º(33) 95º(35) 99º(37) 103º(39) 107º(42)
10%
65º(18) 70º(21) 75º(24) 80º(27) 85º(29) 90º(33) 95º(35) 100º(38) 105º(41) 111º(44) 116º(47)
20%
66º(19) 72º(22) 77º(25) 82º(28) 87º(30) 93º(33) 99º(37) 105º(41) 112º(44) 120º(49) 130º(54)
30%
67º(19) 73º(23) 78º(26) 84º(29) 90º(33) 96º(36) 104º(40) 113º(45) 123º(51) 135º(57) 148º(64)
40%
68º(20) 74º(23) 79º(26) 86º(30) 93º(34) 101º(38) 110º(43) 123º(56) 137º(58) 151º(66)
50%
69º(20) 75º(24) 81º(27) 88º(31) 96º(36) 107º(42) 120º(49) 135º(57) 150º(66)
60%
70º(21) 76º(24) 82º(28) 90º(33) 100º(38) 114º(46) 132º(56) 149º(65)
70%
70º(21) 77º(25) 85º(29) 93º(34) 106º(41) 124º(51) 144º(62)
80%
71º(22) 78º(26) 86º(30) 97º(36) 113º(45) 136º(58)
90%
71º(22) 79º(26) 88º(31) 102º(39) 122º(50)
100%
72º(22) 80º(27) 91º(33) 108º(42)
