Temperatuur — 2026
| Maand | Ridderkerk | Krimpen aan den IJssel | Verschil |
|---|---|---|---|
| Jan | 3 °C | 3 °C | +0.0 |
| Feb | 6.1 °C | 6 °C | +0.1 |
| Mrt | 8.5 °C | 8.4 °C | +0.1 |
| Apr | 10.1 °C | 10.1 °C | +0.0 |
| Mei | 15 °C | 14.5 °C | +0.5 |
| Jun | 19.2 °C | 18.8 °C | +0.4 |
| Jul | 20.2 °C | 19.8 °C | +0.4 |
| Aug |
| 19.6 °C |
| 19.3 °C |
| +0.3 |
| Sep | 17.9 °C | 17.9 °C | +0.0 |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |