This particular scale is primarily used at sea, but it useful to anyone interested in the weather. In 1805, Admiral Sir Francis Beaufort (of the
British Navy) devised the following scale of wind velocity. The numbers are arranged in sequential order, with a low value zero to a high value of
twelve. Listed below is the scale adapted to land.
| Windforce* |
Average
windspeed** |
Median of av. windspeed |
| Beaufort |
Name |
m/s |
km/h |
knots |
miles/h |
m/s |
km/h |
knots |
miles/h |
| 0 |
Calm |
0-0,2 |
< 1 |
< 1 |
<1 |
0,0 |
0,0 |
0,0 |
0,0 |
| 1 |
Light air |
0,3-1,5 |
1-5 |
1-3 |
1-3 |
0,8 |
3,0 |
1,6 |
1,9 |
| 2 |
Light breeze |
1,6-3,3 |
6-11 |
4-6 |
4-7 |
2,4 |
8,5 |
4,6 |
5,3 |
| 3 |
Gentle breeze |
3,4-5,4 |
12-19 |
7-10 |
8-11 |
4,3 |
15,6 |
8,4 |
9,7 |
| 4 |
Moderate breeze |
5,5-7,9 |
20-28 |
11-16 |
13-18 |
6,7 |
24,1 |
13,0 |
15,0 |
| 5 |
Fresh breeze |
8,0-10,7 |
29-38 |
17-21 |
19-24 |
9,3 |
33,6 |
18,2 |
20,9 |
| 6 |
Strong breeze |
10,8-13,8 |
39-49 |
22-27 |
25-31 |
12,3 |
44,2 |
23,9 |
27,5 |
| 7 |
Near gale |
13,9-17,1 |
50-61 |
28-33 |
32-38 |
15,5 |
55,7 |
30,1 |
34,6 |
| 8 |
Gale |
17,2-20,7 |
62-74 |
34-40 |
39-46 |
18,9 |
68,1 |
36,8 |
42,3 |
| 9 |
Strong gale |
20,8-24,4 |
75-88 |
41-47 |
47-54 |
22,6 |
81,3 |
43,9 |
50,5 |
| 10 |
Storm |
24,5-28,4 |
89-102 |
48-55 |
55-63 |
26,4 |
95,2 |
51,4 |
59,1 |
| 11 |
Violent storm |
28,5-32,6 |
103-117 |
56-63 |
64-74 |
30,5 |
109,8 |
59,3 |
68,2 |
| 12 |
Hurricane |
>= 32,7 |
>= 118 |
>= 64 |
>=75 |
... |
... |
... |
... |
|
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