Bewolking — 2025
| Month | Ridderkerk | Krimpen aan den IJssel | Difference |
|---|---|---|---|
| Jan | 79.7 % | 79.9 % | -0.2 |
| Feb | 72.3 % | 72.6 % | -0.3 |
| Mar | 40.8 % | 42.4 % | -1.6 |
| Apr | 44.6 % | 44.8 % | -0.2 |
| May | 48.2 % | 47.7 % | +0.5 |
| Jun | 49.2 % | 48.9 % | +0.3 |
| Jul | 56.9 % | 56.6 % | +0.3 |
| Aug |
| 57.9 % |
| 58.3 % |
| -0.4 |
| Sep | 60.8 % | 60.3 % | +0.5 |
| Oct | 85.7 % | 85.6 % | +0.1 |
| Nov | 76.3 % | 76.3 % | +0.0 |
| Dec | 75.7 % | 76 % | -0.3 |