Neerslag — 2025
| Maand | Alphen aan den Rijn | Kaag en Braassem | Verschil |
|---|---|---|---|
| Jan | 91.9 mm | – | – |
| Feb | 40.4 mm | – | – |
| Mrt | 7.8 mm | – | – |
| Apr | 39.8 mm | – | – |
| Mei | 60.3 mm | – | – |
| Jun | 63.7 mm | – | – |
| Jul | 93.1 mm | – | – |
| Aug | 45.8 mm | – | – |
| Sep |
| 56.4 mm |
| – |
| – |
| Okt | 142.5 mm | – | – |
| Nov | 80.6 mm | – | – |
| Dec | 23.3 mm | – | – |