Wind — 2026
| Month | Heemstede | Haarlem | Difference |
|---|---|---|---|
| Jan | – | 15.2 km/h | – |
| Feb | – | 16.2 km/h | – |
| Mar | 17.8 km/h | 13.4 km/h | +4.4 |
| Apr | 14.7 km/h | 15.1 km/h | -0.4 |
| May | 16.1 km/h | 15.8 km/h | +0.3 |
| Jun | 18.1 km/h | 17.8 km/h | +0.3 |
| Jul | 17.8 km/h | 17.4 km/h | +0.4 |
| Aug |
| 16.5 km/h |
| 16 km/h |
| +0.5 |
| Sep | 19 km/h | 18.8 km/h | +0.2 |
| Oct | 20.3 km/h | 20.1 km/h | +0.2 |
| Nov | – | – | – |
| Dec | – | – | – |