| Number | Name | MPH | Description | |
|---|---|---|---|---|
| 0 | calm | less than 1 | calm; smoke rises vertically | |
| 1 | light air | 1-3 | direction of wind shown by smoke but not by wind vanes | |
| 2 | light breeze | 4-7 | wind felt on face; leaves rustle; ordinary vane moved by wind | |
| 3 | gentle breeze | 8-12 | leaves and small twigs in constant motion; wind extends light flag | |
| 4 | moderate breeze | 13-18 | raises dust and loose paper; small branches are moved | |
| 5 | fresh breeze | 19-24 | small trees in leaf begin to sway; crested waves form on inland waters | |
| 6 | strong breeze | 25-31 | large branches in motion; telegraph wires whistle; umbrellas used with difficulty | |
| 7 | moderate gale (or near gale) | 32-38 | whole trees in motion; inconvenience in walking against wind | |
| 8 | fresh gale | 39-46 | breaks twigs off trees; generally impedes progress | |
| 9 | strong gale | 47-54 | slight structural damage; chimney pots and slates removed | |
| 10 | whole gale (or storm) | 55-63 | trees uprooted; considerable structural damage occurs | |
| 11 | storm (or violent storm) | 64-72 | very rarely experienced; accompanied by widespread damage | |
| 12 | hurricane | 73-136 | devastation occurs |