Wind — 1999
| Month | Assesse | Ciney | Difference |
|---|---|---|---|
| Jan | 20 km/h | – | – |
| Feb | 16.5 km/h | – | – |
| Mar | 15.5 km/h | – | – |
| Apr | 14.3 km/h | – | – |
| May | 12.2 km/h | – | – |
| Jun | 13.1 km/h | – | – |
| Jul | 12 km/h | – | – |
| Aug | 11.7 km/h | – | – |
| Sep |
| 13.9 km/h |
| – |
| – |
| Oct | 16.6 km/h | – | – |
| Nov | 15.6 km/h | – | – |
| Dec | 21 km/h | – | – |