|
|
|
5
|
10
|
15
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
55
|
T
e
m
p
e
r
a
t
u
r
e
|
50°
|
48°
|
46°
|
45°
|
44°
|
43°
|
42°
|
41°
|
41°
|
40°
|
40°
|
40°
|
|
45°
|
42°
|
40°
|
38°
|
37°
|
36°
|
35°
|
35°
|
34°
|
33°
|
33°
|
32°
|
|
40°
|
36°
|
34°
|
32°
|
30°
|
29°
|
28°
|
28°
|
27°
|
26°
|
26°
|
25°
|
|
35°
|
31°
|
27°
|
25°
|
24°
|
23°
|
22°
|
21°
|
20°
|
19°
|
19°
|
18°
|
|
30°
|
25°
|
21°
|
19°
|
17°
|
16°
|
15°
|
14°
|
13°
|
12°
|
12°
|
11°
|
|
25°
|
19°
|
15°
|
13°
|
11°
|
9°
|
8°
|
7°
|
6°
|
5°
|
4°
|
4°
|
|
20°
|
13°
|
9°
|
6°
|
4°
|
3°
|
1°
|
0°
|
- 1°
|
- 2°
|
- 3°
|
- 3°
|
|
15°
|
7°
|
3°
|
0°
|
- 2°
|
- 4°
|
- 5°
|
- 7°
|
- 8°
|
- 9°
|
- 10°
|
- 11°
|
|
10°
|
1°
|
- 4°
|
- 7°
|
- 9°
|
- 11°
|
- 12°
|
- 14°
|
- 15°
|
- 16°
|
- 17°
|
- 18°
|
|
5°
|
- 5°
|
- 10°
|
- 13°
|
- 15°
|
- 17°
|
- 19°
|
- 21°
|
- 22°
|
- 23°
|
- 24°
|
- 25°
|
|
0°
|
- 11°
|
- 16°
|
- 19°
|
- 22°
|
- 24°
|
- 26°
|
- 27°
|
- 29°
|
- 30°
|
- 31°
|
- 32°
|
|
- 5°
|
- 16°
|
- 22°
|
- 26°
|
- 29°
|
- 31°
|
- 33°
|
- 34°
|
- 36°
|
- 37°
|
- 38°
|
- 39°
|
|
- 10°
|
- 22°
|
- 28°
|
- 32°
|
- 35°
|
- 37°
|
- 39°
|
- 41°
|
- 43°
|
- 44°
|
- 45°
|
- 46°
|
|
- 15°
|
- 28°
|
- 35°
|
- 39°
|
- 42°
|
- 44°
|
- 46°
|
- 48°
|
- 50°
|
- 51°
|
- 52°
|
- 54°
|
|
- 20°
|
- 34°
|
- 41°
|
- 45°
|
- 48°
|
- 51°
|
- 53°
|
- 55°
|
- 57°
|
- 58°
|
- 60°
|
- 61°
|
|
- 25°
|
-40°
|
- 47°
|
- 51°
|
- 55°
|
- 58°
|
- 60°
|
- 62°
|
- 64°
|
- 65°
|
- 67°
|
- 68°
|
The wind chill factor is a measure of how quickly your body loses heat. It is not the same as an actual
thermometer reading of the same number. For example, if the temperature is 40°F and the wind
speed is 40 miles per hour, the wind chill factor is 27°F, but water will not freeze.
|
The Effects of Wind Chill
|
|
30° F or greater.
|
Chilly. Generally
unpleasant.
|
|
30° F to 15° F
|
Cold. Unpleasant.
|
|
15° F to 0° F
|
Very cold. Very unpleasant.
|
|
0° F to - 15° F
|
Bitter cold. Frostbite possible.
|
|
- 15° F to - 60° F
|
Extremely cold. Frostbite likely in 10 to 30 minutes.
Outdoor activety becomes dangerous.
|
|
- 60° F or less
|
Frigidly cold. Frostbite likely in less than 5 minutes.
|
|
|
To use the chart, locate the air temperature along
the left column and the wind speed along the
top. The cell where the two intersect is the wind chill
factor.How the wind chill factor is computed. For wind speeds under
5 miles per hour, there is no significant wind chill factor. For wind speeds 5 mph and above, the following
formula may be used to calculate the wind chill factor -- where t is the temperature in degrees and
v is the wind velocity in miles per hour. The National Weather Service put this formula into effect on November 1, 2001.
|