BEAUFORT SCALE: Measured 10m above ground
| Beaufort # | Equivalent Speed (mph) |
Description | SPECIFICATIONS FOR USE ON LAND |
| 0 | 0-1 | Calm | Calm; smoke rises vertically. |
| 1 | 1-3 | Light air | Direction of wind shown by smoke drift, but not by wind vanes. |
| 2 | 4-7 | Light Breeze | Wind felt on face; leaves rustle; ordinary vanes moved by wind. |
| 3 | 8-12 | Gentle Breeze | Leaves and small twigs in constant motion; wind extends light flag. |
| 4 | 13-18 | Moderate Breeze | Raises dust and loose paper; small branches are moved. |
| 5 | 19-24 | Fresh Breeze | Small trees in leaf begin to sway; crested wavelets form on inland waters. |
| 6 | 25-31 | Strong Breeze | Large branches in motion; whistling heard in telephone wires; umbrellas used with difficulty. |
| 7 | 32-38 | Near Gale | Whole trees in motion; inconvenience felt when walking against the wind. |