Neerslag — 2020
| Month | Heemstede | Haarlem | Difference |
|---|---|---|---|
| Jan | 69.1 mm | 65 mm | +4.1 |
| Feb | 126.9 mm | 131.9 mm | -5.0 |
| Mar | 45.3 mm | 48.9 mm | -3.6 |
| Apr | 25.5 mm | 24.6 mm | +0.9 |
| May | 16.9 mm | 18.9 mm | -2.0 |
| Jun | 64.4 mm | 68.7 mm | -4.3 |
| Jul | 71.2 mm | 76.8 mm | -5.6 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |