Zonneschijn — 2020
| Month | Katwijk | Wassenaar | Difference |
|---|---|---|---|
| Jan | 147.4 uren | 149.1 uren | -1.7 |
| Feb | 185.3 uren | 186.8 uren | -1.5 |
| Mar | 303.5 uren | 304.2 uren | -0.7 |
| Apr | 367.2 uren | 367.6 uren | -0.4 |
| May | 430.2 uren | 430.1 uren | +0.1 |
| Jun | 426.2 uren | 427.5 uren | -1.3 |
| Jul | 417.4 uren | 419 uren | -1.6 |
| Aug | – | – | – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |