Neerslag — 2020
| Mois | Leiden | Leiderdorp | Différence |
|---|---|---|---|
| Jan | 69.1 mm | 69.1 mm | +0.0 |
| Fév | 126.9 mm | 126.9 mm | +0.0 |
| Mar | 45.3 mm | 45.3 mm | +0.0 |
| Avr | 25.5 mm | 25.5 mm | +0.0 |
| Mai | 16.9 mm | 16.9 mm | +0.0 |
| Juin | 64.4 mm | 64.4 mm | +0.0 |
| Juil | 71.2 mm | 71.2 mm | +0.0 |
| Aoû |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Déc | – | – | – |