Zonneschijn — 2025
| Month | Alphen aan den Rijn | Kaag en Braassem | Difference |
|---|---|---|---|
| Jan | 97.8 uren | – | – |
| Feb | 141.9 uren | – | – |
| Mar | 301.2 uren | – | – |
| Apr | 323.6 uren | – | – |
| May | 382.6 uren | – | – |
| Jun | 402 uren | – | – |
| Jul | 393.4 uren | – | – |
| Aug | 346.1 uren | – | – |
| Sep | 274.5 uren | – | – |
| Oct | 154.5 uren | – | – |
| Nov | 123 uren | – | – |
| Dec | 96.7 uren | – | – |