Bewolking — 2026
| Month | Hillegom | Heemstede | Difference |
|---|---|---|---|
| Jan | 80.8 % | – | – |
| Feb | 79.4 % | – | – |
| Mar | 55 % | 51.8 % | +3.2 |
| Apr | 77.2 % | 78.2 % | -1.0 |
| May | 57.7 % | 57.7 % | +0.0 |
| Jun | 59.4 % | 59.4 % | +0.0 |
| Jul | 49.8 % | 49.8 % | +0.0 |
| Aug |
| 52.1 % |
| 52.1 % |
| +0.0 |
| Sep | 70.4 % | 70.1 % | +0.3 |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |