Temperatuur — 2026
| Mois | Leiden | Oegstgeest | Différence |
|---|---|---|---|
| Jan | 3.1 °C | – | – |
| Fév | 5.8 °C | – | – |
| Mar | 8.7 °C | 8.4 °C | +0.3 |
| Avr | 10.2 °C | 10 °C | +0.2 |
| Mai | 13.8 °C | 13.8 °C | +0.0 |
| Juin | 18 °C | 18 °C | +0.0 |
| Juil | 19.7 °C | 19.6 °C | +0.1 |
| Aoû |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Déc | – | – | – |