Wind — 2009
| Month | Borgloon | Kortessem | Difference |
|---|---|---|---|
| Jan | 14.2 km/h | – | – |
| Feb | 13.4 km/h | – | – |
| Mar | 15 km/h | – | – |
| Apr | 10.6 km/h | – | – |
| May | 12.5 km/h | – | – |
| Jun | 11.5 km/h | – | – |
| Jul | 13.5 km/h | – | – |
| Aug | 10.6 km/h | – | – |
| Sep |
| 12.8 km/h |
| – |
| – |
| Oct | 13.5 km/h | – | – |
| Nov | 21.5 km/h | – | – |
| Dec | 16 km/h | – | – |