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Apparent Temperature:
REL TEMPERATURE (F)
HUM (%) 70 75 80 85 90 95 100 105 110 115 120 125 130 135
0 64 69 73 78 83 87 91 95 99 103 107 111 117 120
5 64 69 74 79 84 88 93 97 102 107 111 116 122 126
10 65 70 75 80 85 90 95 100 105 111 116 123 131
15 65 71 76 81 86 91 97 102 108 115 123 131
20 66 72 77 82 87 93 99 105 112 120 130 141
25 66 72 77 83 88 94 101 109 117 127 139
30 67 73 78 84 90 96 104 113 123 135 148
35 67 73 79 85 91 98 107 118 130 143
40 68 74 79 86 93 101 110 123 137 151
45 68 74 80 87 95 104 115 129 143
50 69 75 81 88 96 107 120 135 150
55 69 75 81 89 98 110 126 142
60 70 76 82 90 100 114 132 149
65 70 76 83 91 102 119 138
70 70 77 84 93 106 124 144
75 70 77 85 95 109 130 150
80 71 78 86 97 113 136
85 71 78 87 99 117 140
90 71 79 88 102 122 150
95 71 79 89 105 126
100 72 80 90 108 131

Explanation

The apparent temperature is a measure of relative discomfort due to combined heat and high humidity. It was developed by R.G. Steadman (1979) and is based on physiological studies of evaporative skin cooling for various combinations of ambient temperature and humidity. The apparent temperature equals the actual air temperature when the dew-point temperature is 57.2F (14C). At higher dew-points, the apparent temperature exceeds the actual temperature and measures the increased physiological heat stress and discomfort associated with higher than comfortable humidities. When the dew-point is less than 57.2F, on the other hand, the apparent temperature is less than the actual air temperature and measures the reduced stress and increased comfort associated with lower humidities and greater evaporative skin cooling.

Apparent temperatures greater than 80F are generally associated with some discomfort. Values approaching or exceeding 105F are considered life-threatening, with severe heat exhaustion or heatstroke possible if exposure is prolonged or physical activity high. The degree of heat stress may vary with age, health, and body characteristics.

Apparent Temperature Chart and Explanation courtesy of the Climate Analysis Center.
University of Virginia Climatology Office
Department of Environmental Sciences
291 McCormick Road
P.O. Box 400123
Charlottesville, VA  22904-4123
climate@virginia.edu
434-924-0548

visits since January 20, 2000