Temperatuur — 2020
| Month | Súdwest-Fryslân | Harlingen | Difference |
|---|---|---|---|
| Jan | 6.1 °C | 6.6 °C | -0.5 |
| Feb | 6.7 °C | 6.8 °C | -0.1 |
| Mar | 6.4 °C | 6.5 °C | -0.1 |
| Apr | 9.7 °C | 9.3 °C | +0.4 |
| May | 12.2 °C | 11.8 °C | +0.4 |
| Jun | 16.7 °C | 16.1 °C | +0.6 |
| Jul | 16.7 °C | 16.6 °C | +0.1 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |