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  Measuring the Heat   

The heat index is an apparent temperature, or a measure of how hot it feels when temperature and humidity are combined. The heat index is the mostly commonly used method of measuring heat. It is the result of extensive biometeorological studies. It takes into account many parameters including body size and shape, core and body surface temperatures, clothing and the skin's resistance to heat and moisture transfer. The heat index values used in National Weather Service forecasts and warnings, and in heat index tables assume an average size adult, with clothing, in the shade, with a 5-mph wind. Being in full sun or in an area with no air movement can significantly increase the apparent temperature.

  70 75 80 85 90 95 100 105 110 115 120 125 130 135 140
100 72 80 91 108                      
95 71 79 89 105                      
90 71 79 88 102 122                    
85 71 78 87 99 117                    
80 71 78 86 97 113 136                  
75 70 77 86 95 109 130                  
70 70 77 85 93 106 124 144                
65 70 76 83 91 102 119 138                
60 70 76 82 90 100 114 132 149              
55 69 75 81 89 98 110 126 142              
50 69 75 81 88 95 107 120 134 150            
45 68 74 80 87 95 104 115 129 143            
40 68 74 79 86 93 101 110 123 137 151          
35 67 73 79 85 91 98 107 118 130 143          
30 67 73 78 84 90 96 104 113 123 135 148        
25 66 72 77 83 88 94 101 109 117 127 139        
20 66 72 77 82 87 93 99 105 112 120 130 141      
15 65 71 76 81 86 91 97 102 108 115 123 131      
10 65 70 75 80 85 90 95 100 105 111 116 123 131    
5 64 69 74 79 84 88 93 97 102 107 111 116 122 128  
0 64 69 73 78 83 87 91 95 99 103 107 111 117 120 125

 

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