| Beaufort Number | Descriptive Term |
Mean Wind Speed Equivalent | |
| Knots | M/Sec | ||
| 0 | Calm | <1 | 0-0.2 |
| 1 | Light air | 1-3 | 0.3-1.5 |
| 2 | Light breeze | 4-6 | 1.6-3.3 |
| 3 | Gentle breeze | 7-10 | 3.4-5.4 |
| 4 | Moderate | 11-16 | 5.5-7.9 |
| 5 | Fresh breeze | 17-21 | 8.0-10.7 |
| 6 | Strong breeze | 22-27 | 10.8-13.8 |
| 7 | Near gale | 28-33 | 13.9-17.1 |
| 8 | Gale | 35-40 | 17.2-20.7 |
| 9 | Strong gale | 41-47 | 20.8-24.4 |
| 10 | Storm | 48-55 | 24.5-28.4 |
| 11 | Violent storm | 56-63 | 28.5-32.6 |
| 12 | Hurricane | 64 and over | 32.7 and over |
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