Bewolking — 2026
| Month | Katwijk | Oegstgeest | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 52.8 % | 53.4 % | -0.6 |
| Apr | 78.4 % | 78.3 % | +0.1 |
| May | 57.7 % | 57.7 % | +0.0 |
| Jun | 59.4 % | 59.4 % | +0.0 |
| Jul | 49.8 % | 49.8 % | +0.0 |
| Aug |
| 52.1 % |
| 52.1 % |
| +0.0 |
| Sep | 71.3 % | 71.3 % | +0.0 |
| Oct | 64.6 % | 65.2 % | -0.6 |
| Nov | – | – | – |
| Dec | – | – | – |