Zonneschijn — 2020
| Month | Alphen aan den Rijn | Leiderdorp | Difference |
|---|---|---|---|
| Jan | 143.8 uren | 147.4 uren | -3.6 |
| Feb | 183.4 uren | 185.3 uren | -1.9 |
| Mar | 300.9 uren | 303.5 uren | -2.6 |
| Apr | 366.6 uren | 367.2 uren | -0.6 |
| May | 429.9 uren | 430.2 uren | -0.3 |
| Jun | 421.2 uren | 426.2 uren | -5.0 |
| Jul | 414.5 uren | 417.4 uren |
| Aug | – | – | – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |