Neerslag — 2020
| Month | Nissewaard | Maassluis | Difference |
|---|---|---|---|
| Jan | 47 mm | 56 mm | -9.0 |
| Feb | 114.8 mm | 113.8 mm | +1.0 |
| Mar | 49.4 mm | 43.8 mm | +5.6 |
| Apr | 25.6 mm | 26.4 mm | -0.8 |
| May | 11.3 mm | 10.6 mm | +0.7 |
| Jun | 72.3 mm | 64.3 mm | +8.0 |
| Jul | 61.7 mm | 59.6 mm | +2.1 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |