Temperatuur — 2026
| Monat | Heemstede | Haarlem | Unterschied |
|---|---|---|---|
| Jan | – | 3 °C | – |
| Feb | – | 5.4 °C | – |
| Mär | 8.1 °C | 8.6 °C | -0.5 |
| Apr | 9.6 °C | 10 °C | -0.4 |
| Mai | 13.8 °C | 13.5 °C | +0.3 |
| Jun | 18 °C | 17.8 °C | +0.2 |
| Jul | 19.2 °C | 18.9 °C | +0.3 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dez | – | – | – |