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 | 16.8 km/h | 16.5 km/h | +0.3 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |