Wind — 2026
| Month | Velsen | Haarlem | Difference |
|---|---|---|---|
| Jan | – | 15.2 km/h | – |
| Feb | – | 16.2 km/h | – |
| Mar | 20.4 km/h | 13.4 km/h | +7.0 |
| Apr | 15.7 km/h | 15.1 km/h | +0.6 |
| May | 19.2 km/h | 15.8 km/h | +3.4 |
| Jun | 21.4 km/h | 17.8 km/h | +3.6 |
| Jul | 21.1 km/h | 17.4 km/h | +3.7 |
| Aug |
| 19.8 km/h |
| 16 km/h |
| +3.8 |
| Sep | 23.5 km/h | 18.8 km/h | +4.7 |
| Oct | 24.2 km/h | 19.7 km/h | +4.5 |
| Nov | – | – | – |
| Dec | – | – | – |