Heat Index Chart - Noaa

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Heat Index Chart
The ‘Heat Index’ is a measure of how hot weather "feels" to the body. This table uses relative humidity and air
temperature to produce the "apparent temperature" or the temperature the body "feels". These values are for
shady locations only. Exposure to full sunshine can increase heat index values by up to 15°F. Also, strong winds,
o
by Temperature ( F) and Relative Humidity (%)
particularly with very hot, dry air, can be extremely hazardous as the wind adds heat to the body.
Relative Humidity (%)
%
4
6
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 %
126
113 116 119 123 126
130 134 138 142 147 151 156 161 166 171 177 182
126
Heat Index/Apparent
Category
Classification
General Affect on People in High Risk Groups
Temperature
124
112 114 117 120 123 127
130 134 138 142 146 151 155 160 165 170 175 180
124
Extremely
Heat/Sunstroke HIGHLY LIKELY with
IV
130°F
122
110 113 115 118 121 124 127
130 134 138 141 145 150 154 158 163 168 173 178 183
122
continued exposure
Hot
120
109 111 113 116 118 121 124 127
130 133 137 140 144 148 152 156 161 165 170 175 180
Sunstroke, heat cramps, or heat exhaustion
120
III
Very Hot
105°F - 129°F
LIKELY, and heatstroke POSSIBLE with
118
107 109 111 113 116 118 121 123 126 129
132 135 139 142 146 150 154 158 162 167 171 176 181
118
prolonged exposure and/or physical activity
Sunstroke, heat cramps, or heat exhaustion
116
106 108 109 111 113 115 117 120 122 125 128
131 134 137 140 144 148 151 155 159 164 168 172 177 182
116
II
Hot
90°F - 104°F
POSSIBLE with prolonged exposure and/or
physical activity
114
105 106 107 109 111 112 114 117 119 121 124 126 129
132 135 138 141 145 148 152 156 160 164 168 173 177 182
114
Very
Fatigue POSSIBLE with prolonged
112
103 104
105 107 108 110 112 113 115 117 120 122 124 127
130 133 136 139 142 145 149 152 156 160 164 168 172 177 181
112
I
80°F - 89°F
exposure and/or physical activity
Warm
110
101 102 103
104 106 107 109 110 112 114 116 118 120 122 125 127
130 133 136 139 142 145 149 152 156 159 163 167 171 175 180
110
108
99 100 101 102 103
105 106 107 109 110 112 114 116 118 120 122 125 127
130 132 135 138 141 144 148 151 155 158 162 166 170 174 178 182
108
106
97 98 99 100 101 102 103
105 106 107 109 110 112 114 116 118 120 122 124 127
129
132 135 137 140 143 146 150 153 157 160 164 168 172 176 180
106
104
96 96 97 98 99 100 101 102 103 104
105 107 108 110 111 113 115 117 119 121 123 126 128
131 133 136 139 142 145 148 151 154 158 161 165 169 173 176 181
104
102
94 95 95 96 97 98 98 99 100 101 102 103
105 106 107 109 110 112 114 116 118 120 122 124 127 129
132 134 137 140 143 146 149 152 155 158 162 165 169 173 177 180
102
100
92 93 93 94 95 96 96 97 97 98 99 100 101 102 104
105 106 108 109 111 113 114 116 118 120 123 125 127 129
132 135 137 140 143 146 149 152 155 158 162 165 168 172 176 179 183
100
98
91 91 92 92 93 93 94 94 95 96 96 97 98 99 100 101 102 104
105 106 108 109 111 113 115 116 118 120 123 125 127 129
132 134 137 140 142 145 148 151 154 157 160 164 167 170 174 177 181
98
96
89 89
90 90 91 91 92 92 93 93 94 94 95 96 97 98 99 100 101 102 103
105 106 108 109 111 113 114 116 118 120 122 124 126 129
131 133 136 138 141 144 146 149 152 155 158 161 164 168
96
94
87 88 88 89 89
90 90 90 90 91 91 92 92 93 94 94 95 96 97 98 99 100 102 103 104
106 107 109 110 112 114 115 117 119 121 123 125 127 129
132 134 136 139 141 144 147 149 152 155
94
92
86 86 86 87 87 88 88 88 88 89 89 89
90
90 91 92 92 93 94 95 96 96 98 99 100 101 102 103
105 106 108 109 111 112 114 116 117 119 121 123 125 127 129
131 133 136 138 140 143
92
90
84 85 85 85 86 86 86 86 86 87 87 87 88 88 88 89 89
90 91 91 92 93 94 95 96 96 98 99 100 101 102 103
105 106 107 109 110 112 113 115 117 118 120 122 124 126 128
130 132
90
88
83 83 83 84 84 84 84 84 85 85 85 85 85 86 86 86 87 87 88 88 89
90 90 91 92 93 93 94 95 96 97 98 99 100 101 103 104
105 106 108 109 110 112 113 115 116 118 120 121
88
86
81 82 82 82 82 83 83 83 83 83 83 83 84 84 84 84 85 85 85 86 86 87 87 88 88 89
90 90 91 92 93 93 94 95 96 97 98 99 100 101 102 103 104
105 107 108 109 110 112
86
84
80 80 80 81 81 81 81 81 81 81 82 82 82 82 82 82 83 83 83 84 84 84 85 85 86 86 86 87 88 88 89 89
90 90 91 92 93 93 94 95 96 96 97 98 99 100 101 102 104
84
82
79 79 79 79 79
80 80 80 80 80 80 80 80 80 81 81 81 81 81 82 82 82 83 83 83 83 84 84 84 85 85 86 86 86 87 87 88 88 89 89
90 90 91 92 93 94 94 95 96
82
80
78 78 78 78 78 78 78 79 79 79 79 79 79 79 79
79
80 80 80 80 80 80 81 81 81 81 81 82 82 82 82 82 83 83 83 83 84 84 84 85 85 85 86 86 87 88 88 89 89
80
78
76 76 76 76 76 76 76 76 76 77 77 77 77 77 77 77 77 77 77 77 78 78 78 78 78 78
78 78 78 78 79 79 79 79 79 79
80 80 80 80 80 80 80 80 81 81 81 81 81
78
76
73 74 74 74 74 74 74 74 74 74 74 75 75 75 75 75 75 75 75 75 75 75 76 76 76 76 76 76 76 76 76 76 76 77 77 77 77 77 77 77 77 77 77 78 78 78 78 78 78
76
%
4
6
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 %
Relative Humidity (%)

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