Extreme Caution - Sunstroke, muscle cramps and/or heat exhaustion possible
Caution - Fatigue possible
As one who is severely discomforted by a combination of heat and humidity, this kind of table is of great interest. If I am going to be miserable, I want to know exactly how miserable I really am! This information is derived from NOAA. Click here for a windchill chart.
NOAA provides the following equation for calculating heat index: 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 (°F) R = relative humidity (integer percentage) "Because this equation is obtained by multiple regression analysis, (HI) has an error of ±1.3°F"
Air Temp (°F)
Relative Humidity (%)
40
45
50
55
60
65
70
75
80
85
90
95
100
110
136
108
130
137
106
124
130
137
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
136
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
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