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Heat Index Chart
Temp          Dew Point(F)
 (F)     50.0  55.0  60.0  65.0  70.0  75.0  80.0  85.0 
--------------------------------------------------------
  65:    62.7  63.8  65.0  66.6                         
  70:    67.8  68.7  69.8  71.1  72.6                   
  75:    73.1  73.9  74.8  75.9  79.2  80.7             
  80:    79.8  80.6  81.6  82.8  84.4  86.9  90.9       
  85:    83.5  84.7  86.1  88.0  90.5  94.0  99.0 106.6 
  90:    87.9  89.4  91.2  93.6  96.9 101.2 107.2 115.6 
  95:    92.9  94.5  96.7  99.6 103.4 108.4 115.2 124.3 
 100:    98.1  99.9 102.4 105.6 109.8 115.3 122.7 132.3 
 105:   103.4 105.4 108.1 111.6 116.1 122.0 129.7 139.7 
 110:   108.7 110.9 113.8 117.5 122.3 128.4 136.3 146.5 

Temp       Relative Humidity (%)
 (F)    90.0  80.0  70.0  60.0  50.0  40.0  30.0  20.0  10.0 
------------------------------------------------------------
  65:   65.6  64.7  63.8  62.8  61.9  60.9  60.0  59.1  58.1 
  70:   71.6  70.7  69.8  68.8  67.9  66.9  66.0  65.1  64.1 
  75:   79.7  76.7  75.8  74.8  73.9  72.9  72.0  71.1  70.1 
  80:   88.2  85.9  84.2  82.8  81.6  80.4  79.0  77.4  76.1 
  85:  101.4  97.0  93.3  90.3  87.7  85.5  83.5  81.6  79.6 
  90:  119.3 112.0 105.8 100.5  96.1  92.3  89.2  86.5  84.2 
  95:  141.8 131.1 121.7 113.6 106.7 100.9  96.1  92.2  89.2 
 100:  168.7 154.0 140.9 129.5 119.6 111.2 104.2  98.7  94.4 
 105:  200.0 180.7 163.4 148.1 134.7 123.2 113.6 105.8 100.0 
 110:  235.6 211.2 189.1 169.4 151.9 136.8 124.1 113.7 105.8 
 115:  275.3 245.4 218.0 193.3 171.3 152.1 135.8 122.3 111.9 
 120:  319.1 283.1 250.0 219.9 192.9 169.1 148.7 131.6 118.2 

Any value less than 80 is considered comfortable.
Any value greater than 90 is considered extreme.
Any value greater than 100 is considered hazardous.
Any value greater than 110 is considered dangerous.