HEAT INDEX °F (°C)
  RELATIVE HUMIDITY (%)
Temp. 40 45 50 55 60 65 70 75 80 85 90 95 100
110
(47)		 136
(58)		                        
108
(43)		 130
(54)		 137
(58)		                      
106
(41)		 124
(51)		 130
(54)		 137
(58)		                    
104
(40)		 119
(48)		 124
(51)		 131
(55)		 137
(58)		                  
102
(39)		 114
(46)		 119
(48)		 124
(51)		 130
(54)		 137
(58)		                
100
(38)		 109
(43)		 114
(46)		 118
(48)		 124
(51)		 129
(54)		 136
(58)		              
98
(37)		 105
(41)		 109
(43)		 113
(45)		 117
(47)		 123
(51)		 128
(53)		 134
(57)		            
96
(36)		 101
(38)		 104
(40)		 108
(42)		 112
(44)		 116
(47)		 121
(49)		 126
(52)		 132
(56)		          
94
(34)		 97
(36)		 100
(38)		 103
(39)		 106
(41)		 110
(43)		 114
(46)		 119
(48)		 124
(51)		 129
(54)		 135
(57)		      
92
(33)		 94
(34)		 96
(36)		 99
(37)		 101
(38)		 105
(41)		 108
(42)		 112
(44)		 116
(47)		 121
(49)		 126
(52)		 131
(55)		    
90
(32)		 91
(33)		 93
(34)		 95
(35)		 97
(36)		 100
(38)		 103
(39)		 106
(41)		 109
(43)		 113
(45)		 117
(47)		 122
(50)		 127
(53)		 132
(56)
88
(31)		 88
(31)		 89
(32)		 91
(33)		 93
(34)		 95
(35)		 98
(37)		 100
(38)		 103
(39)		 106
(41)		 110
(43)		 113
(45)		 117
(47)		 121
(49)
86
(30)		 85
(29)		 87
(31)		 88
(31)		 89
(32)		 91
(33)		 93
(34)		 95
(35)		 97
(36)		 100
(38)		 102
(39)		 105
(41)		 108
(42)		 112
(44)
84
(29)		 83
(28)		 84
(29)		 85
(29)		 86
(30)		 88
(31)		 89
(32)		 90
(32)		 92
(33)		 94
(34)		 96
(36)		 98
(37)		 100
(38)		 103
(39)
82
(28)		 81
(27)		 82
(28)		 83
(28)		 84
(29)		 84
(29)		 85
(29)		 86
(30)		 88
(31)		 89
(32)		 90
(32)		 91
(33)		 93
(34)		 95
(35)
80
(27)		 80
(27)		 80
(27)		 81
(27)		 81
(27)		 82
(28)		 82
(28)		 83
(28)		 84
(29)		 84
(29)		 85
(29)		 86
(30)		 86
(30)		 87
(31)

Category Heat Index Possible heat disorders for people in high risk groups
Extreme
Danger		 130°F or higher
(54°C or higher)		 Heat stroke or sunstroke likely.
Danger 105 - 129°F
(41 - 54°C)		 Sunstroke, muscle cramps, and/or heat exhaustion likely. Heatstroke possible with prolonged exposure and/or physical activity.
Extreme
Caution		 90 - 105°F
(32 - 41°C)		 Sunstroke, muscle cramps, and/or heat exhaustion possible with prolonged exposure and/or physical activity.
Caution 80 - 90°F
(27 - 32°C)		 Fatigue possible with prolonged exposure and/or physical activity.
  • National Weather Service
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  • Page last modified: 1-Nov-2005 9:03 PM UTC
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