Apparent Temperature Chart

Rel
Humid
%
Air Temperature
(Degrees Fahrenheit)
859095100105110
20 82 87 93 99105112
30 84 90 96104113123
40 86 93101110123137
50 88 96107120135150
60 90100114132149
70 93106124144
80 97113130
90102122
100108

CATEGORYAPPARENT TEMPHEAT SYMPTOMS
I > 130 degreesHeatstroke imminent.
II105 to 130 degreesSunstroke likely, heatstroke possible.
III90 to 105 degreesSunstroke possible.
IV80 to 90 degreesFatigue possible.

Greater than 130 degrees (F).....EXTREME DANGER: HEATSTROKE IMMINENT!
105 to 130 degrees......................Danger: Sunstroke likely, heatstroke possible
90 to 105 degrees........................Extreme Caution: Sunstroke possible
80 to 90 degrees..........................Caution: Fatigue possible
Less than 80 degrees...................No Heat Stress on people

HOW TO USE THE "APPARENT TEMPERATURE" CHART

If the outside air temperature was currently 100 degrees (F) and relative humidity was currently 50%, the apparent temperature would be 120 degrees (see chart). This means the outside temperature would feel like it was 120 degrees. Under these conditions sunstroke would be likely and heatstroke possible if exposure is prolonged. Keep in mind that the actural degree of heat stress experienced will vary with individual age, health, and body characteristics.

SOURCE: NOAA

Additional information concerning the Heat Index and Heat Exposure...click Here.