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