Bewolking — 2026
| Month | Ridderkerk | Zwijndrecht | Difference |
|---|---|---|---|
| Jan | 78.3 % | 76.7 % | +1.6 |
| Feb | 81.5 % | 81.4 % | +0.1 |
| Mar | 53.1 % | 55.2 % | -2.1 |
| Apr | 78.6 % | 58.5 % | +20.1 |
| May | 59 % | 59.2 % | -0.2 |
| Jun | 61.6 % | 62.2 % | -0.6 |
| Jul | 47.4 % | 43.9 % | +3.5 |
| Aug |
| 54.3 % |
| 54 % |
| +0.3 |
| Sep | 72.6 % | 70.7 % | +1.9 |
| Oct | 65.9 % | 62.5 % | +3.4 |
| Nov | – | – | – |
| Dec | – | – | – |