Temperatuur — 2026
| Month | Leiden | Zoeterwoude | Difference |
|---|---|---|---|
| Jan | 3.1 °C | – | – |
| Feb | 5.8 °C | – | – |
| Mar | 8.7 °C | 7.3 °C | +1.4 |
| Apr | 10.2 °C | 8.9 °C | +1.3 |
| May | 13.8 °C | 14.5 °C | -0.7 |
| Jun | 18 °C | 18.8 °C | -0.8 |
| Jul | 19.3 °C | 19.8 °C | -0.5 |
| Aug |
| 19.3 °C |
| 19.3 °C |
| +0.0 |
| Sep | 17.3 °C | 17 °C | +0.3 |
| Oct | 13.5 °C | 12.7 °C | +0.8 |
| Nov | – | – | – |
| Dec | – | – | – |