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Thanks to Lans Rothfusz, MIC at NWS Tulsa, OK for the following table.

http://www.crh.noaa.gov

HEAT INDEX °F (°C)
 RELATIVE HUMIDITY (%)
Temp.404550556065707580859095100
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)

 

CategoryHeat IndexPossible heat disorders for people in high risk groups
Extreme
Danger		130°F or higher
(54°C or higher)		Heat stroke or sunstroke likely.
Danger105 - 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.
Caution80 - 90°F
(27 - 32°C)		Fatigue possible with prolonged exposure and/or physical activity.

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