Bewolking — 2026
| Monat | Haarlem | Velsen | Unterschied |
|---|---|---|---|
| Jan | 81.7 % | – | – |
| Feb | 78.3 % | – | – |
| Mär | 57.1 % | 53.4 % | +3.7 |
| Apr | 81.3 % | 81.2 % | +0.1 |
| Mai | 57.7 % | 56.2 % | +1.5 |
| Jun | 59.8 % | 58.1 % | +1.7 |
| Jul | 51.9 % | 50.5 % | +1.4 |
| Aug |
| 51.5 % |
| 49.8 % |
| +1.7 |
| Sep | 70.1 % | 70 % | +0.1 |
| Okt | 67.6 % | 67 % | +0.6 |
| Nov | 96.4 % | 93.3 % | +3.1 |
| Dez | – | – | – |