Neerslag — 2026
| Maand | Alphen aan den Rijn | Leiderdorp | Verschil |
|---|---|---|---|
| Jan | 89 mm | – | – |
| Feb | 64.1 mm | – | – |
| Mrt | 64.1 mm | 8.3 mm | +55.8 |
| Apr | 4.2 mm | 4.2 mm | +0.0 |
| Mei | 64.4 mm | 39.4 mm | +25.0 |
| Jun | 84.6 mm | 73 mm | +11.6 |
| Jul | 5.7 mm | 7.8 mm | -2.1 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |