Bewolking — 2025
| Month | Haarlemmermeer | Haarlem | Difference |
|---|---|---|---|
| Jan | 79.1 % | 78.5 % | +0.6 |
| Feb | 72.5 % | 72.9 % | -0.4 |
| Mar | 44 % | 43.4 % | +0.6 |
| Apr | 46.5 % | 46.8 % | -0.3 |
| May | 45.6 % | 46 % | -0.4 |
| Jun | 47.2 % | 47.6 % | -0.4 |
| Jul | 55.5 % | 55 % | +0.5 |
| Aug |
| 57.8 % |
| 58.2 % |
| -0.4 |
| Sep | 60.9 % | 61.7 % | -0.8 |
| Oct | 84.3 % | 85.2 % | -0.9 |
| Nov | 76.4 % | 76.1 % | +0.3 |
| Dec | 76.4 % | 76.5 % | -0.1 |