| No. | Name | Speed mph | Speed kph | Description |
| 0 | Calm | Less than 1 | Less than 1 | Calm; smoke rises vertically |
| 1 | Light air | 1-3 | 1-5 | Direction of wind shown by smoke but not by wind vanes |
| 2 | Light breeze | 4-7 | 6-11 | Wind felt on face; leaves rustle; wind vane moves |
| 3 | Gentle breeze | 8-12 | 12-19 | Leaves and small twigs in constant motion; wind extends light flag |
| 4 | Moderate breeze | 13-18 | 20-28 | Wind raises dust and loose paper; small branches move |
| 5 | Fresh breeze | 19-24 | 29-38 | Small-leaved trees begin to sway; crested wavelets form on inland waters |
| 6 | Strong breeze | 25-31 | 39-49 | Large branches move; overhead wires whistle; umbrellas difficult to control |
| 7 | Moderate or near gale | 32-38 | 50-61 | Whole trees sway; walking against wind is difficult |
| 8 | Fresh gale | 39-46 | 62-74 | Twigs break off trees; moving cars veer |
| 9 | Strong gale | 47-54 | 75-88 | Slight structural damage occurs; shingles may blow away |
| 10 | Whole gale or storm | 55-63 | 89-102 | Trees uprooted; considerable structural damage occurs |
| 11 | Storm or violent storm | 64-72 | 103-117 | Widespread damage occurs |
| 12 | Hurricane | Greater than 72 | Greater than 117 | Widespread damage occurs |
