Wind — 1999
| Month | Lierde | Herzele | Difference |
|---|---|---|---|
| Jan | 18.2 km/h | – | – |
| Feb | 15.7 km/h | – | – |
| Mar | 13.7 km/h | – | – |
| Apr | 13.7 km/h | – | – |
| May | 12.6 km/h | – | – |
| Jun | 12.9 km/h | – | – |
| Jul | 12.3 km/h | – | – |
| Aug | 11.2 km/h | – | – |
| Sep |
| 13.4 km/h |
| – |
| – |
| Oct | 15.5 km/h | – | – |
| Nov | 15.1 km/h | – | – |
| Dec | 19.3 km/h | – | – |