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Descriptive terms of wind speeds

Beaufort Scale Number
Description
Mean wind speed in knots
Mean wind speed in km/h
Illustration
0
Calm
<1
< 2
F0
1
Light
1-3
2 - 6
F1
2
4-6
7 - 12
F2
3
Moderate
7-10
13 - 19
F3
4
11-16
20 - 30
F4
5
Fresh
17-21
31 - 40
F5
6
Strong
22-27
41 - 51
F6
7
28-33
52 - 62
F7
8
Gale
34-40
63 - 75
F8
9
41-47
76 - 87
F9
10
Storm
48-55
88 - 103
F10
11
56-63
104 - 117
F11
12
Hurricane
>=64
>= 118
F12