Air Temperature (degrees Fahrenheit)

(Relative Humidity Percent) 70 75 80 85 90 95 100 105 110 115 120 125 130 135 5 64 69 74 79 84 88 93 97 102 107 111 116 122 128 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 85 93 106 124 144 75 70 77 86 95 109 130 80 71 78 86 97 113 136 85 71 78 87 99 117 90 71 79 88 102 122 95 71 79 89 105

(Table is from the National Oceanic and Atmospheric Administration)

(Source: Amended at 22 Ill. Reg. 7162, effective April 15, 1998)