Bewolking — 2026
| Monat | Haarlem | Heemstede | Unterschied |
|---|---|---|---|
| Jan | 81.7 % | – | – |
| Feb | 78.3 % | – | – |
| Mär | 57.1 % | 51.8 % | +5.3 |
| Apr | 81.3 % | 78.2 % | +3.1 |
| Mai | 57.7 % | 57.7 % | +0.0 |
| Jun | 59.8 % | 59.4 % | +0.4 |
| Jul | 51.9 % | 49.8 % | +2.1 |
| Aug |
| 51.5 % |
| 52.1 % |
| -0.6 |
| Sep | 70.1 % | 71.3 % | -1.2 |
| Okt | 67.6 % | 66.3 % | +1.3 |
| Nov | 85.1 % | 84.1 % | +1.0 |
| Dez | – | – | – |