Bewolking — 2023
| Month | Alphen aan den Rijn | Waddinxveen | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 100 % | 100 % | +0.0 |
| Apr | 66 % | 66.6 % | -0.6 |
| May | 63.5 % | 63.1 % | +0.4 |
| Jun | 43.4 % | 43.5 % | -0.1 |
| Jul | 63.6 % | 63.6 % | +0.0 |
| Aug |
| 60.1 % |
| 59.8 % |
| +0.3 |
| Sep | 63.6 % | 63.1 % | +0.5 |
| Oct | 83.1 % | 82.4 % | +0.7 |
| Nov | 78.5 % | 77.5 % | +1.0 |
| Dec | 83.3 % | 83.1 % | +0.2 |