Zonneschijn — 2023
| Month | Castricum | Heemskerk | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 0 uren | – | – |
| Apr | 262.8 uren | – | – |
| May | 358.2 uren | – | – |
| Jun | 392.6 uren | – | – |
| Jul | 364.9 uren | – | – |
| Aug | 332 uren | – | – |
| Sep |
| 274.5 uren |
| – |
| – |
| Oct | 163 uren | – | – |
| Nov | 117.3 uren | – | – |
| Dec | 83.6 uren | – | – |