Bewolking — 2020
| Month | Súdwest-Fryslân | Harlingen | Difference |
|---|---|---|---|
| Jan | 81.5 % | 81.5 % | +0.0 |
| Feb | 72.7 % | 71.9 % | +0.8 |
| Mar | 50.4 % | 48.3 % | +2.1 |
| Apr | 42.7 % | 45.4 % | -2.7 |
| May | 45.2 % | 45 % | +0.2 |
| Jun | 68.1 % | 65.7 % | +2.4 |
| Jul | 61.7 % | 61.6 % | +0.1 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |