Temperatuur — 2026
| Month | Hardinxveld-Giessendam | Sliedrecht | Difference |
|---|---|---|---|
| Jan | 2.7 °C | – | – |
| Feb | 6 °C | – | – |
| Mar | 8.3 °C | 7.7 °C | +0.6 |
| Apr | 9.7 °C | 9.7 °C | +0.0 |
| May | 15 °C | 15 °C | +0.0 |
| Jun | 19.3 °C | 19.3 °C | +0.0 |
| Jul | 20.2 °C | 20.2 °C | +0.0 |
| Aug |
| 19.5 °C |
| 19.5 °C |
| +0.0 |
| Sep | 17.7 °C | 17.6 °C | +0.1 |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |