Bewolking — 2020
| Maand | Maassluis | Nissewaard | Verschil |
|---|---|---|---|
| Jan | 77.1 % | 77.6 % | -0.5 |
| Feb | 73.4 % | 74.2 % | -0.8 |
| Mrt | 52.7 % | 52.5 % | +0.2 |
| Apr | 37 % | 35.4 % | +1.6 |
| Mei | 45.8 % | 46.6 % | -0.8 |
| Jun | 64.5 % | 64.5 % | +0.0 |
| Jul | 60.3 % | 60.9 % | -0.6 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |