Wind — 2020
| Month | Voorschoten | Leiden | Difference |
|---|---|---|---|
| Jan | 19.1 km/h | 24.1 km/h | -5.0 |
| Feb | 26.8 km/h | 32.6 km/h | -5.8 |
| Mar | 19.5 km/h | 24 km/h | -4.5 |
| Apr | 13.9 km/h | 16.8 km/h | -2.9 |
| May | 14.5 km/h | 17.6 km/h | -3.1 |
| Jun | 14.4 km/h | 17.5 km/h | -3.1 |
| Jul | 14.8 km/h | 18.2 km/h | -3.4 |
| Aug | – | – | – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |