Temperatuur — 2020
| Maand | Maassluis | Nissewaard | Verschil |
|---|---|---|---|
| Jan | 6.8 °C | 6.5 °C | +0.3 |
| Feb | 7.4 °C | 7.4 °C | +0.0 |
| Mrt | 7 °C | 7.1 °C | -0.1 |
| Apr | 10.6 °C | 11.2 °C | -0.6 |
| Mei | 12.9 °C | 13.5 °C | -0.6 |
| Jun | 16.8 °C | 17.3 °C | -0.5 |
| Jul | 17.1 °C | 17.3 °C | -0.2 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |