Neerslag — 2026
| Month | Alphen aan den Rijn | Kaag en Braassem | Difference |
|---|---|---|---|
| Jan | 89 mm | – | – |
| Feb | 64.1 mm | – | – |
| Mar | 64.1 mm | 6.4 mm | +57.7 |
| Apr | 4.2 mm | 4.3 mm | -0.1 |
| May | 64.4 mm | 52.1 mm | +12.3 |
| Jun | 84.6 mm | 86.3 mm | -1.7 |
| Jul | 14.8 mm | 13.1 mm | +1.7 |
| Aug |
| 59.2 mm |
| 76.9 mm |
| -17.7 |
| Sep | 63.3 mm | 83.3 mm | -20.0 |
| Oct | 93.2 mm | 118.9 mm | -25.7 |
| Nov | – | – | – |
| Dec | – | – | – |