Bewolking — 2026
| Month | Leiden | Oegstgeest | Difference |
|---|---|---|---|
| Jan | 80.9 % | – | – |
| Feb | 79.6 % | – | – |
| Mar | 57.9 % | 53.4 % | +4.5 |
| Apr | 78.6 % | 78.3 % | +0.3 |
| 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 | 64.7 % | 64.5 % | +0.2 |
| Nov | – | – | – |
| Dec | – | – | – |