Zonneschijn — 2020
| Month | Vlieland | Harlingen | Difference |
|---|---|---|---|
| Jan | 137.9 uren | 135.4 uren | +2.5 |
| Feb | 185.8 uren | 185 uren | +0.8 |
| Mar | 306.4 uren | 305.6 uren | +0.8 |
| Apr | 370.9 uren | 370.8 uren | +0.1 |
| May | 432.7 uren | 432.4 uren | +0.3 |
| Jun | 432 uren | 429.7 uren | +2.3 |
| Jul | 420.2 uren | 419 uren | +1.2 |
| Aug | – | – | – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |