Zonneschijn — 2020
| Month | Maassluis | Nissewaard | Difference |
|---|---|---|---|
| Jan | 147.4 uren | 145.3 uren | +2.1 |
| Feb | 185.3 uren | 184.2 uren | +1.1 |
| Mar | 301.6 uren | 298.9 uren | +2.7 |
| Apr | 367.3 uren | 366.8 uren | +0.5 |
| May | 429.6 uren | 428.5 uren | +1.1 |
| Jun | 423.3 uren | 420.1 uren | +3.2 |
| Jul | 419.5 uren | 417.3 uren | +2.2 |
| Aug | – | – | – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |