Neerslag — 2026
| Mois | Alphen aan den Rijn | Kaag en Braassem | Différence |
|---|---|---|---|
| Jan | 89 mm | – | – |
| Fév | 64.1 mm | – | – |
| Mar | 64.1 mm | 6.4 mm | +57.7 |
| Avr | 4.2 mm | 4.3 mm | -0.1 |
| Mai | 64.4 mm | 52.1 mm | +12.3 |
| Juin | 84.6 mm | 86.3 mm | -1.7 |
| Juil | 14.8 mm | 13.1 mm | +1.7 |
| Aoû |
| 59.2 mm |
| 76.9 mm |
| -17.7 |
| Sep | 38 mm | 41.5 mm | -3.5 |
| Oct | – | – | – |
| Nov | – | – | – |
| Déc | – | – | – |