Bewolking — 2026
| Month | Velsen | Haarlem | Difference |
|---|---|---|---|
| Jan | – | 81.7 % | – |
| Feb | – | 78.3 % | – |
| Mar | 53.4 % | 57.1 % | -3.7 |
| Apr | 81.2 % | 81.3 % | -0.1 |
| May | 56.2 % | 57.7 % | -1.5 |
| Jun | 58.1 % | 59.8 % | -1.7 |
| Jul | 50.5 % | 51.9 % | -1.4 |
| Aug |
| 49.8 % |
| 51.5 % |
| -1.7 |
| Sep | 70 % | 70.1 % | -0.1 |
| Oct | 66.2 % | 66.6 % | -0.4 |
| Nov | – | – | – |
| Dec | – | – | – |