Neerslag — 2026
| Month | Castricum | Heemskerk | Difference |
|---|---|---|---|
| Jan | 90.3 mm | – | – |
| Feb | 60.3 mm | – | – |
| Mar | 60.4 mm | 1.3 mm | +59.1 |
| Apr | 3.5 mm | 2.9 mm | +0.6 |
| May | 49.5 mm | 49.5 mm | +0.0 |
| Jun | 100.9 mm | 101.1 mm | -0.2 |
| Jul | 14.4 mm | 14.4 mm | +0.0 |
| Aug |
| 93.7 mm |
| 93.8 mm |
| -0.1 |
| Sep | 68.6 mm | 65.1 mm | +3.5 |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |