Neerslag — 2020
| Month | Zoeterwoude | Leiden | Difference |
|---|---|---|---|
| Jan | 50.7 mm | 69.1 mm | -18.4 |
| Feb | 117.9 mm | 126.9 mm | -9.0 |
| Mar | 48.1 mm | 45.3 mm | +2.8 |
| Apr | 27.7 mm | 25.5 mm | +2.2 |
| May | 14.3 mm | 16.9 mm | -2.6 |
| Jun | 60.4 mm | 64.4 mm | -4.0 |
| Jul | 58 mm | 71.2 mm | -13.2 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |