Zonneschijn — 2026
| Month | Hardinxveld-Giessendam | Altena | Difference |
|---|---|---|---|
| Jan | 115.7 uren | – | – |
| Feb | 125.6 uren | – | – |
| Mar | 270.1 uren | 16.8 uren | +253.3 |
| Apr | 28.6 uren | 30.4 uren | -1.8 |
| May | 418.8 uren | 416.8 uren | +2.0 |
| Jun | 418.5 uren | 416 uren | +2.5 |
| Jul | 438.1 uren | 436.1 uren | +2.0 |
| Aug |
| 389.4 uren |
| 385.6 uren |
| +3.8 |
| Sep | 96.4 uren | 96.7 uren | -0.3 |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |