Bewolking — 2020
| Maand | Bloemendaal | Heemstede | Verschil |
|---|---|---|---|
| Jan | 79 % | 78 % | +1.0 |
| Feb | 73.3 % | 73.4 % | -0.1 |
| Mrt | 51.4 % | 52.7 % | -1.3 |
| Apr | 39.7 % | 38.5 % | +1.2 |
| Mei | 43.7 % | 45.1 % | -1.4 |
| Jun | 64.2 % | 65.3 % | -1.1 |
| Jul | 60.4 % | 61.2 % | -0.8 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |