| Beaufort | MPH | M/S | Knots | Km/T | Description |
|---|
| Force 1 | 1-3 | 0.3-1.6 | 1-3 | 1-5 | Light air
Direction of wind shown by smoke drift but not by wind vanes |
| Force 2 | 4-7 | 1.7-3.2 | 4-6 | 6-11 | Light breeze
Wind felt on face; leaves rustle; ordinary vane moved by wind |
| Force 3 | 8-12 | 3.3-5.4 | 7-10 | 12-19 | Gentle breeze leaves and small twigs in constant motion; wind extends light flag |
| Force 4 | 13-18 | 5.5-7.9 | 11-16 | 20-28 | Moderate breeze raises dust and loose paper; small branches are moved |
| Force 5 | 19-24 | 8.0-10.7 | 17-21 | 29-38 | Fresh breeze small trees in leaf begin to sway; crested wavelets form on inland waters |
| Force 6 | 25-31 | 10.8-13.7 | 22-27 | 39-49 | Strong breeze large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty |
