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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site wind speed The rate of flow of the wind undisturbed by obstacles. Wind speed scale Wind Speed at 10 m height Beaufort scale Wind 0.0-0.4 m/s (0.0-0.9 knots) 0 Calm 0.4-1.8 m/s (0.9-3.5 knots) 1 Light 1.8-3.6 m/s (3.5-7.0 knots) 2 Light 3.6-5.8 m/s (7-11 knots) 3 Light 5.8-8.5 m/s (11-17 knots) 4 Moderate 8.5-11 m/s (17-22 knots) 5 Fresh 11-14 m/s (22-28 knots) 6 Strong 14-17 m/s (28-34 knots) 7 Strong 17-21 m/s (34-41 knots) 8 Gale 21-25 m/s (41-48 knots) 9 Gale 25-29 m/s (48-56 knots) 10 Strong Gale 29-34 m/s (56-65 knots) 11   >34 m/s (>65 knots) 12 Hurricane 1 m/s = 3.6 km/h = 2.237 mph = 1.944 knots 1 knot = 1 nautical mile per hour = 0.5144 m/s = 1.852 km/h = 1.125 mph Related category    • WIND POWER Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP