Neerslag — 2020
| Mois | Haarlem | Heemstede | Différence |
|---|---|---|---|
| Jan | 65 mm | 69.1 mm | -4.1 |
| Fév | 131.9 mm | 126.9 mm | +5.0 |
| Mar | 48.9 mm | 45.3 mm | +3.6 |
| Avr | 24.6 mm | 25.5 mm | -0.9 |
| Mai | 18.9 mm | 16.9 mm | +2.0 |
| Juin | 68.7 mm | 64.4 mm | +4.3 |
| Juil | 76.8 mm | 71.2 mm | +5.6 |
| Aoû |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Déc | – | – | – |