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p) Beaufort scale
Below the wind speed display, you will find a bar chart for the Beaufort scale.
Beaufort
Description
Wind speed
Effect on land
0
Calm
< 1 km/h
No movement of the air, smoke rises up
straight
< 1 mph
< 1 knots
< 0.3 m/s
1
Slight draft
1.1 - 5.5 km/h
Barely noticeable movement of the air,
smoke drifts off slightly, wind blades/wind
vanes are not moved.
1 - 3 mph
1 - 3 knots
0.3 - 1.5 m/s
2
Slight breeze
5.6 - 11 km/h
Leaves rustle slightly, wind can be felt in
the face
4 - 7 mph
4 - 6 knots
1.6 - 3.4 m/s
3
Weak breeze
12 - 19 km/h
Leaves and thinner twigs move, pennants
are stretched
8 - 12 mph
7 - 10 knots
3.5 - 5.4 m/s
4
Moderate breeze
20 - 28 km/h
Twigs move, loose paper is blown from the
ground
13 - 17 mph
11 - 16 knots
5.5 - 7.9 m/s
5
Fresh breeze
29 - 38 km/h
Larger twigs/branches and trees move, the
wind is clearly audible
18 - 24 mph
17 - 21 knots
8.0 - 10.7 m/s