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
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