Bewolking — 2026
| Maand | Nissewaard | Vlaardingen | Verschil |
|---|---|---|---|
| Jan | – | 79.8 % | – |
| Feb | – | 81.8 % | – |
| Mrt | 56.8 % | 57.9 % | -1.1 |
| Apr | 79.4 % | 80.5 % | -1.1 |
| Mei | 58.2 % | 57.1 % | +1.1 |
| Jun | 60.6 % | 59.8 % | +0.8 |
| Jul | 46.1 % | 47.8 % | -1.7 |
| Aug |
| 53.9 % |
| 53.1 % |
| +0.8 |
| Sep | 74.4 % | 73.4 % | +1.0 |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |