Temperatuur — 2026
| Maand | Midden-Delfland | Maassluis | Verschil |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mrt | 7.5 °C | 7.8 °C | -0.3 |
| Apr | 9.1 °C | 9.4 °C | -0.3 |
| Mei | 14.4 °C | 14.4 °C | +0.0 |
| Jun | 18.4 °C | 18.4 °C | +0.0 |
| Jul | 19.4 °C | 19.5 °C | -0.1 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |