Wind — 1999
| Month | Ferrières | Hamoir | Difference |
|---|---|---|---|
| Jan | 19.8 km/h | – | – |
| Feb | 16.6 km/h | – | – |
| Mar | 15.7 km/h | – | – |
| Apr | 14.2 km/h | – | – |
| May | 12.3 km/h | – | – |
| Jun | 13 km/h | – | – |
| Jul | 11.8 km/h | – | – |
| Aug | 11.8 km/h | – | – |
| Sep |
| 13.7 km/h |
| – |
| – |
| Oct | 17.1 km/h | – | – |
| Nov | 15.1 km/h | – | – |
| Dec | 21.1 km/h | – | – |