Neerslag — 2020
| Mois | Haarlemmermeer | Heemstede | Différence |
|---|---|---|---|
| Jan | 62.1 mm | 69.1 mm | -7.0 |
| Fév | 132.9 mm | 126.9 mm | +6.0 |
| Mar | 49.7 mm | 45.3 mm | +4.4 |
| Avr | 24.2 mm | 25.5 mm | -1.3 |
| Mai | 22.2 mm | 16.9 mm | +5.3 |
| Juin | 71.5 mm | 64.4 mm | +7.1 |
| Juil | 72.7 mm | 71.2 mm | +1.5 |
| Aoû |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Déc | – | – | – |