Bewolking — 2026
| Maand | Katwijk | Wassenaar | Verschil |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mrt | 52.8 % | 53.7 % | -0.9 |
| Apr | 78.4 % | 79.3 % | -0.9 |
| Mei | 57.7 % | 55.5 % | +2.2 |
| Jun | 59.4 % | 58.1 % | +1.3 |
| Jul | 49.8 % | 48.5 % | +1.3 |
| Aug |
| 52.1 % |
| 50.7 % |
| +1.4 |
| Sep | 71.2 % | 71.3 % | -0.1 |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |