Temperatuur — 2026
| Monat | Alkmaar | Heiloo | Unterschied |
|---|---|---|---|
| Jan | 2.8 °C | – | – |
| Feb | 5 °C | – | – |
| Mär | 8.3 °C | 7.8 °C | +0.5 |
| Apr | 9.6 °C | 9 °C | +0.6 |
| Mai | 13.2 °C | 13.5 °C | -0.3 |
| Jun | 17.3 °C | 17.8 °C | -0.5 |
| Jul | 18.7 °C | 18.9 °C | -0.2 |
| Aug |
| 18.9 °C |
| 19 °C |
| -0.1 |
| Sep | 17.2 °C | 17.1 °C | +0.1 |
| Okt | 13.5 °C | 13.2 °C | +0.3 |
| Nov | 11.3 °C | 10.3 °C | +1.0 |
| Dez | – | – | – |