Temperatuur — 2026
| Monat | Katwijk | Wassenaar | Unterschied |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mär | 8.2 °C | 7.9 °C | +0.3 |
| Apr | 9.6 °C | 9.2 °C | +0.4 |
| Mai | 13.8 °C | 13.3 °C | +0.5 |
| Jun | 18 °C | 17.3 °C | +0.7 |
| Jul | 19.3 °C | 19 °C | +0.3 |
| Aug |
| 19.3 °C |
| 19.4 °C |
| -0.1 |
| Sep | 17.8 °C | 17.7 °C | +0.1 |
| Okt | – | – | – |
| Nov | – | – | – |
| Dez | – | – | – |