Neerslag — 2026
| Mois | Leiden | Zoeterwoude | Différence |
|---|---|---|---|
| Jan | 87.4 mm | – | – |
| Fév | 68.7 mm | – | – |
| Mar | 41.8 mm | 5.6 mm | +36.2 |
| Avr | 3.7 mm | 3.4 mm | +0.3 |
| Mai | 39.4 mm | 51.3 mm | -11.9 |
| Juin | 73 mm | 74.9 mm | -1.9 |
| Juil | 14.6 mm | 14.7 mm | -0.1 |
| Aoû |
| 81 mm |
| 60.4 mm |
| +20.6 |
| Sep | 55.6 mm | 39 mm | +16.6 |
| Oct | – | – | – |
| Nov | – | – | – |
| Déc | – | – | – |