Temperatuur — 2026
| Mois | Leiden | Leiderdorp | Différence |
|---|---|---|---|
| Jan | 3.1 °C | – | – |
| Fév | 5.8 °C | – | – |
| Mar | 8.7 °C | 7.7 °C | +1.0 |
| Avr | 10.2 °C | 9.2 °C | +1.0 |
| Mai | 13.8 °C | 13.8 °C | +0.0 |
| Juin | 18 °C | 18 °C | +0.0 |
| Juil | 19.3 °C | 19.3 °C | +0.0 |
| Aoû |
| 19.3 °C |
| 19.3 °C |
| +0.0 |
| Sep | 17.9 °C | 17.5 °C | +0.4 |
| Oct | – | – | – |
| Nov | – | – | – |
| Déc | – | – | – |