Temperatuur — 2026
| Month | Zoeterwoude | Leiden | Difference |
|---|---|---|---|
| Jan | – | 3.1 °C | – |
| Feb | – | 5.8 °C | – |
| Mar | 7.3 °C | 8.7 °C | -1.4 |
| Apr | 8.9 °C | 10.2 °C | -1.3 |
| May | 14.5 °C | 13.8 °C | +0.7 |
| Jun | 18.8 °C | 18 °C | +0.8 |
| Jul | 19.2 °C | 19.4 °C | -0.2 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |