Neerslag — 2026
| Mois | Leiden | Oegstgeest | Différence |
|---|---|---|---|
| Jan | 87.4 mm | – | – |
| Fév | 68.7 mm | – | – |
| Mar | 41.8 mm | 7.8 mm | +34.0 |
| Avr | 3.7 mm | 3 mm | +0.7 |
| Mai | 39.4 mm | 39.4 mm | +0.0 |
| Juin | 73 mm | 73 mm | +0.0 |
| Juil | 14.6 mm | 14.6 mm | +0.0 |
| Aoû |
| 81 mm |
| 80.8 mm |
| +0.2 |
| Sep | 57.3 mm | 58.6 mm | -1.3 |
| Oct | – | – | – |
| Nov | – | – | – |
| Déc | – | – | – |