Heat Index Table |
|
Relative Humidity (%) |
Temp oF |
40 |
45 |
50 |
55 |
60 |
65 |
70 |
75 |
80 |
85 |
90 |
95 |
100 |
110 |
136 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
108 |
130 |
137 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
106 |
124 |
130 |
137 |
- |
- |
- |
- |
- |
Apparent Temperature Click for U.S. Map |
104 |
119 |
124 |
131 |
137 |
- |
- |
- |
- |
102 |
114 |
119 |
124 |
130 |
137 |
- |
- |
- |
- |
- |
- |
- |
- |
100 |
109 |
114 |
118 |
124 |
129 |
136 |
- |
- |
- |
- |
- |
- |
- |
98 |
105 |
109 |
113 |
117 |
123 |
128 |
134 |
- |
- |
- |
- |
- |
- |
96 |
101 |
104 |
108 |
112 |
116 |
121 |
126 |
132 |
- |
- |
- |
- |
- |
94 |
97 |
100 |
102 |
106 |
110 |
114 |
119 |
124 |
129 |
135 |
- |
- |
- |
92 |
94 |
96 |
99 |
101 |
105 |
108 |
112 |
116 |
121 |
126 |
131 |
- |
- |
90 |
91 |
93 |
95 |
97 |
100 |
103 |
106 |
109 |
113 |
117 |
122 |
127 |
132 |
88 |
88 |
89 |
91 |
93 |
95 |
98 |
100 |
103 |
106 |
110 |
113 |
117 |
121 |
86 |
85 |
87 |
88 |
89 |
91 |
93 |
95 |
97 |
100 |
102 |
105 |
108 |
112 |
84 |
83 |
84 |
85 |
86 |
88 |
89 |
90 |
92 |
94 |
96 |
98 |
100 |
103 |
82 |
81 |
82 |
83 |
84 |
84 |
85 |
86 |
88 |
89 |
90 |
91 |
93 |
95 |
80 |
80 |
80 |
81 |
81 |
82 |
82 |
83 |
84 |
84 |
85 |
86 |
86 |
87 |
With Prolonged Exposure and/or Physical Activity: |
Extreme Danger: Heat Stroke or Sunstroke likely |
Danger: Sunstroke, muscle cramps, and/or heat exhaustion likely |
Extreme Caution: Sunstroke, muscle cramps, and/or heat exhaustion possible |
Caution: Fatigue possible |
HI = -42.379 + 2.04901523T + 10.14333127R - 0.22475541TR - 6.83783x10-3T2 - 5.481717x10-2R2 + 1.22874x10-3T2R + 8.5282x10-4TR2 - 1.99x10-6T2R2
Where:
T = ambient dry bulb temperature
R = relative humidity
|