Bewolking — 2026
| Month | Schiedam | Vlaardingen | Difference |
|---|---|---|---|
| Jan | – | 79.8 % | – |
| Feb | – | 81.8 % | – |
| Mar | 58.5 % | 57.9 % | +0.6 |
| Apr | 79.9 % | 80.5 % | -0.6 |
| 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 | 73.7 % | 73.1 % | +0.6 |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |