Neerslag — 2026
| Mois | Haarlem | Velsen | Différence |
|---|---|---|---|
| Jan | 90.4 mm | – | – |
| Fév | 79.8 mm | – | – |
| Mar | 36.6 mm | 0.7 mm | +35.9 |
| Avr | 4.3 mm | 3.2 mm | +1.1 |
| Mai | 49.5 mm | 41.4 mm | +8.1 |
| Juin | 100.9 mm | 77 mm | +23.9 |
| Juil | 11.4 mm | 15.3 mm | -3.9 |
| Aoû |
| 0 mm |
| 0 mm |
| +0.0 |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Déc | – | – | – |