Bewolking — 2020
| Maand | Haarlemmermeer | Haarlem | Verschil |
|---|---|---|---|
| Jan | 79.1 % | 79.5 % | -0.4 |
| Feb | 73.9 % | 73.8 % | +0.1 |
| Mrt | 53.2 % | 52.2 % | +1.0 |
| Apr | 39 % | 40 % | -1.0 |
| Mei | 45.9 % | 44.8 % | +1.1 |
| Jun | 66.1 % | 66.1 % | +0.0 |
| Jul | 62.3 % | 61.8 % | +0.5 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |