Neerslag — 2026
| Month | Katwijk | Wassenaar | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 6.2 mm | 3.5 mm | +2.7 |
| Apr | 3.4 mm | 3.4 mm | +0.0 |
| May | 39.4 mm | 37.7 mm | +1.7 |
| Jun | 73 mm | 71.1 mm | +1.9 |
| Jul | 14.6 mm | 16.5 mm | -1.9 |
| Aug |
| 80.8 mm |
| 100.7 mm |
| -19.9 |
| Sep | 92.9 mm | 110.6 mm | -17.7 |
| Oct | 124.6 mm | 139.3 mm | -14.7 |
| Nov | – | – | – |
| Dec | – | – | – |