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Heat Index Chart
Heat index (or apparent temperature) is how
the heat and humidity in the air combine to make us feel. Higher
humidity plus higher temperatures often combine to make us feel a
perceived temperature that is higher than the actual air temperature.
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Heat Index Chart |
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% Relative Humidity
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| |
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15 |
20 |
25 |
30 |
35 |
40 |
45 |
50 |
55 |
60 |
65 |
70 |
75 |
80 |
85 |
90 |
|
T
e
m
p
e
r
a
t
u
r
e |
110 |
108 |
112 |
117 |
123 |
130 |
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|
|
|
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105 |
102 |
105 |
108 |
113 |
117 |
122 |
130 |
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100 |
97 |
98 |
102 |
104 |
107 |
110 |
115 |
120 |
126 |
132 |
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|
|
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95 |
91 |
93 |
95 |
96 |
98 |
100 |
104 |
106 |
109 |
113 |
119 |
124 |
130 |
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90 |
86 |
87 |
88 |
90 |
91 |
92 |
95 |
97 |
98 |
100 |
103 |
106 |
110 |
114 |
117 |
121 |
|
85 |
81 |
82 |
83 |
84 |
85 |
86 |
87 |
88 |
89 |
90 |
92 |
94 |
96 |
97 |
100 |
102 |
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80 |
76 |
77 |
78 |
78 |
79 |
79 |
80 |
81 |
82 |
83 |
84 |
85 |
86 |
87 |
88 |
89 |
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Legend |
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80-89 degrees
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Fatigue is
possible with prolonged exposure and/or physical activity. |
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90-104 degrees
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Sunstroke,
heat cramps and heat exhaustion are possible with prolonged
exposure and/or physical activity. |
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105-129 degrees
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Sunstroke,
heat cramps and heat exhaustion are likely. Heat stroke is
possible with prolonged exposure and/or physical activity. |
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130+ degrees
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Heatstroke/sunstroke is highly likely with continued exposure. |
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Above is a heat index (or apparent
temperature) chart showing various combinations of air temperature
versus relative humidity.
To use the chart, locate the air temperature along the left
column and the relative humidity along the top. The cell
where the two intersect is the heat index.
For example, an air temperature of 90 degrees Fahrenheit and a
relative humidity of 60 percent intersect at a heat index of 100
degrees. In other words, the temperature would feel like 100 degrees
with this humidity/temperature combination.
Heat index values were devised for shady light wind conditions.
Exposure to full sunlight can increase values by up to 15 degrees
Fahrenheit.
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