Neerslag — 2026
| Month | Maassluis | Nissewaard | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 6.1 mm | 5 mm | +1.1 |
| Apr | 2.4 mm | 2 mm | +0.4 |
| May | 39.8 mm | 56.9 mm | -17.1 |
| Jun | 72.8 mm | 79.2 mm | -6.4 |
| Jul | 13.9 mm | 13.3 mm | +0.6 |
| Aug |
| 62.4 mm |
| 52.3 mm |
| +10.1 |
| Sep | 43.7 mm | 31 mm | +12.7 |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |