Bewolking — 2020
| Month | Wassenaar | Leidschendam-Voorburg | Difference |
|---|---|---|---|
| Jan | 77.7 % | 77.9 % | -0.2 |
| Feb | 72.8 % | 73.8 % | -1.0 |
| Mar | 52.1 % | 53.2 % | -1.1 |
| Apr | 37.9 % | 37.7 % | +0.2 |
| May | 44.4 % | 46.5 % | -2.1 |
| Jun | 62.8 % | 65.7 % | -2.9 |
| Jul | 59.2 % | 62 % | -2.8 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |