Bewolking — 2026
| Maand | Heemstede | Haarlem | Verschil |
|---|---|---|---|
| Jan | – | 81.7 % | – |
| Feb | – | 78.3 % | – |
| Mrt | 51.8 % | 57.1 % | -5.3 |
| Apr | 78.2 % | 81.3 % | -3.1 |
| Mei | 57.7 % | 57.7 % | +0.0 |
| Jun | 59.4 % | 59.8 % | -0.4 |
| Jul | 49.8 % | 51.9 % | -2.1 |
| Aug |
| 52.1 % |
| 51.5 % |
| +0.6 |
| Sep | 71.3 % | 70.1 % | +1.2 |
| Okt | 66 % | 67.2 % | -1.2 |
| Nov | – | – | – |
| Dec | – | – | – |