Bewolking — 2024
| Month | Alphen aan den Rijn | Kaag en Braassem | Difference |
|---|---|---|---|
| Jan | 70.9 % | – | – |
| Feb | 87.1 % | – | – |
| Mar | 80.9 % | – | – |
| Apr | 76.3 % | – | – |
| May | 67.3 % | – | – |
| Jun | 61.7 % | – | – |
| Jul | 66.3 % | – | – |
| Aug | 60.6 % | – | – |
| Sep |
| 58.1 % |
| – |
| – |
| Oct | 67.9 % | – | – |
| Nov | 77.6 % | – | – |
| Dec | 91.7 % | – | – |