Luchtvochtigheid — 2020
| Month | Katwijk | Wassenaar | Difference |
|---|---|---|---|
| Jan | 88 % | 86.9 % | +1.1 |
| Feb | 79.9 % | 79.6 % | +0.3 |
| Mar | 74.4 % | 75.9 % | -1.5 |
| Apr | 69.4 % | 73.1 % | -3.7 |
| May | 71.9 % | 75.4 % | -3.5 |
| Jun | 76.7 % | 79.8 % | -3.1 |
| Jul | 76.8 % | 77.8 % | -1.0 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |