Luchtvochtigheid — 2020
| Month | Katwijk | Voorschoten | Difference |
|---|---|---|---|
| Jan | 88 % | 88.9 % | -0.9 |
| Feb | 79.9 % | 80.2 % | -0.3 |
| Mar | 74.4 % | 73.2 % | +1.2 |
| Apr | 69.4 % | 66.4 % | +3.0 |
| May | 71.9 % | 67.9 % | +4.0 |
| Jun | 76.7 % | 73.9 % | +2.8 |
| Jul | 76.8 % | 76.4 % | +0.4 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |