Bewolking — 2026
| Month | Zoeterwoude | Leiden | Difference |
|---|---|---|---|
| Jan | – | 80.9 % | – |
| Feb | – | 79.6 % | – |
| Mar | 55.6 % | 57.9 % | -2.3 |
| Apr | 78.4 % | 78.6 % | -0.2 |
| May | 58.6 % | 57.7 % | +0.9 |
| Jun | 61 % | 59.4 % | +1.6 |
| Jul | 49.2 % | 49.8 % | -0.6 |
| Aug |
| 53.9 % |
| 52.1 % |
| +1.8 |
| Sep | 72.4 % | 71.3 % | +1.1 |
| Oct | 65 % | 65.1 % | -0.1 |
| Nov | – | – | – |
| Dec | – | – | – |