Temperatuur — 2020
| Maand | Harlingen | Vlieland | Verschil |
|---|---|---|---|
| Jan | 6.6 °C | 7 °C | -0.4 |
| Feb | 6.8 °C | 7 °C | -0.2 |
| Mrt | 6.5 °C | 6.7 °C | -0.2 |
| Apr | 9.3 °C | 9.1 °C | +0.2 |
| Mei | 11.8 °C | 11.5 °C | +0.3 |
| Jun | 16.1 °C | 15.7 °C | +0.4 |
| Jul | 16.6 °C | 16.4 °C | +0.2 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |