Heat index graph
Comparison of National Weather Service heat index values (circles) with the formula approximation in the Wikipedia article (curves), by CMG Lee. In the SVG file, hover over a graph to highlight it.
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
80
85
90
95
100
105
110
115
120
125
25
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
50
Relativehumidity
Actual temperature (°F)
Actual temperature (°C)
Feels-like temperature (°F)
Feels-like temperature (°C)
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%