Neerslag — 2026
| Month | Alphen aan den Rijn | Leiderdorp | Difference |
|---|---|---|---|
| Jan | 89 mm | – | – |
| Feb | 64.1 mm | – | – |
| Mar | 64.1 mm | 8.3 mm | +55.8 |
| Apr | 4.2 mm | 4.2 mm | +0.0 |
| May | 64.4 mm | 39.4 mm | +25.0 |
| Jun | 84.6 mm | 73 mm | +11.6 |
| Jul | 14.8 mm | 14.6 mm | +0.2 |
| Aug |
| 59.2 mm |
| 81 mm |
| -21.8 |
| Sep | 63.3 mm | 93.1 mm | -29.8 |
| Oct | 93.2 mm | 128.4 mm | -35.2 |
| Nov | – | – | – |
| Dec | – | – | – |