Wind — 2020
| Month | Heemstede | Haarlem | Difference |
|---|---|---|---|
| Jan | 24.1 km/h | 23.9 km/h | +0.2 |
| Feb | 32.6 km/h | 32 km/h | +0.6 |
| Mar | 24 km/h | 23.6 km/h | +0.4 |
| Apr | 16.8 km/h | 16.7 km/h | +0.1 |
| May | 17.6 km/h | 17.1 km/h | +0.5 |
| Jun | 17.5 km/h | 16.8 km/h | +0.7 |
| Jul | 18.2 km/h | 17.5 km/h | +0.7 |
| Aug | – | – | – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |