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Dr. Dewpoint


Apparent Temperature/Heat Index Table

Below is the Heat Index (or Apparent Temperature) Table. It measures the effects of humidity and temperature on the human body in a similar fashion to wind chill. Relative humidity is along the top, and the outside temperature is listed along the left hand side. The values in the table are in degrees fahrenheit. A "-1" in the table indicates that the heat index temperature is so great it is off the scale.


         +-------------------------------------------------------+
         |               RELATIVE HUMIDITY (%)                   |
         |                                                       |
         |  0   10   20   30   40   50   60   70   80   90  100  |
+--------+-------------------------------------------------------+
|        |                                                       |
|   68 F | 61   63   63   64   66   66   68   68   70   70   70  |
|        |                                                       |
|   70 F | 64   64   66   66   68   68   70   70   72   72   73  |
|        |                                                       |
|   72 F | 66   66   68   68   70   70   72   72   73   73   75  |
|        |                                                       |
|   74 F | 68   68   70   72   72   73   73   75   75   75   77  |
|        |                                                       |
|   76 F | 70   72   72   73   73   75   75   77   77   79   79  |
|        |                                                       |
|   78 F | 75   75   77   77   79   79   81   81   82   84   86  |
|        |                                                       |
|   80 F | 77   77   79   79   81   81   82   84   86   88   91  |
|        |                                                       |
|   82 F | 79   79   81   81   82   84   84   88   90   93   97  |
|        |                                                       |
| T 84 F | 79   81   81   82   84   86   88   91   95   99  104  |
|        |                                                       |
| E 86 F | 81   82   82   84   86   88   91   95   99  104  113  |
|        |                                                       |
| M 88 F | 82   84   84   86   88   91   95   99  104  113  127  |
|        |                                                       |
| P 90 F | 84   84   86   88   91   95   99  104  111  124  144  |
|        |                                                       |
| E 92 F | 84   84   86   88   91   97  102  109  120  136   -1  |
|        |                                                       |
| R 94 F | 86   88   90   93   97  100  108  117  131   -1   -1  |
|        |                                                       |
| A 96 F | 90   91   95   99  102  109  120  136   -1   -1   -1  |
|        |                                                       |
| T 98 F | 90   93   97  100  106  115  129   -1   -1   -1   -1  |
|        |                                                       |
| U 100F | 91   95   99  104  111  120  136   -1   -1   -1   -1  |
|        |                                                       |
| R 102F | 93   97  100  106  115  129   -1   -1   -1   -1   -1  |
|        |                                                       |
| E 104F | 95   99  104  109  120  138   -1   -1   -1   -1   -1  |
|        |                                                       |
|   106F | 95  100  106  113  126   -1   -1   -1   -1   -1   -1  |
|        |                                                       |
|   108F | 97  102  108  117  133   -1   -1   -1   -1   -1   -1  |
|        |                                                       |
|   110F | 99  104  111  120  140   -1   -1   -1   -1   -1   -1  |
|        |                                                       |
|   112F |100  106  113  126  147   -1   -1   -1   -1   -1   -1  |
|        |                                                       |
|   114F |102  109  122  138   -1   -1   -1   -1   -1   -1   -1  |
|        |                                                       |
|   116F |104  111  124  145   -1   -1   -1   -1   -1   -1   -1  |
|        |                                                       |
|   118F |106  113  127  153   -1   -1   -1   -1   -1   -1   -1  |
|        |                                                       |
|   120F |108  117  133   -1   -1   -1   -1   -1   -1   -1   -1  |
|        |                                                       |
|   122F |108  118  140   -1   -1   -1   -1   -1   -1   -1   -1  |
|        |                                                       |
+--------+-------------------------------------------------------+

HEAT INDEX 80 - 85: FEW PEOPLE BEGIN TO FEEL UNCOMFORTABLE.

HEAT INDEX 85 - 90: ABOUT HALF OF THE PEOPLE FEEL UNCOMFORTABLE.

HEAT INDEX 90 - 104: SUNSTROKE, HEAT CRAMPS AND HEAT EXHAUSTION ARE POSSIBLE WITH PROLONGED EXPOSURE AND PHYSICAL ACTIVITY.

HEAT INDEX 105 - 129: SUNSTROKE, HEAT CRAMPS, OR HEAT EXHAUSTION LIKELY. HEATSTROKE POSSIBLE WITH PROLONGED EXPOSURE AND PHYSICAL ACTIVITY.

HEAT INDEX 130 OR HIGHER: HEATSTROKE OR SUNSTROKE IMMINENT.


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