Neerslag — 2020
| Maand | Voorne aan Zee | Maassluis | Verschil |
|---|---|---|---|
| Jan | 49.7 mm | 56 mm | -6.3 |
| Feb | 111.5 mm | 113.8 mm | -2.3 |
| Mrt | 50.8 mm | 43.8 mm | +7.0 |
| Apr | 28.1 mm | 26.4 mm | +1.7 |
| Mei | 9.4 mm | 10.6 mm | -1.2 |
| Jun | 77.5 mm | 64.3 mm | +13.2 |
| Jul | 59.8 mm | 59.6 mm | +0.2 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |