Bewolking — 2026
| Month | Schiedam | Midden-Delfland | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 58.5 % | 58.4 % | +0.1 |
| Apr | 79.9 % | 81.9 % | -2.0 |
| May | 58.6 % | 57.1 % | +1.5 |
| Jun | 61 % | 59.8 % | +1.2 |
| Jul | 49.2 % | 47.8 % | +1.4 |
| Aug |
| 53.9 % |
| 53.1 % |
| +0.8 |
| Sep | 72.5 % | 72.1 % | +0.4 |
| Oct | 66.2 % | 65.3 % | +0.9 |
| Nov | – | – | – |
| Dec | – | – | – |