Luchtvochtigheid — 2020
| Month | Heemstede | Haarlem | Difference |
|---|---|---|---|
| Jan | 88 % | 88.3 % | -0.3 |
| Feb | 79.9 % | 80.4 % | -0.5 |
| Mar | 74.4 % | 75 % | -0.6 |
| Apr | 69.4 % | 69.8 % | -0.4 |
| May | 71.9 % | 73.9 % | -2.0 |
| Jun | 76.7 % | 77.9 % | -1.2 |
| Jul | 76.8 % | 78.9 % | -2.1 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |