Bewolking — 2023
| Month | Spa | Verviers | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 88.9 % | 88.5 % | +0.4 |
| Apr | 67.4 % | 67.9 % | -0.5 |
| May | 65 % | 64.3 % | +0.7 |
| Jun | 42.9 % | 43.3 % | -0.4 |
| Jul | 65.1 % | 65.9 % | -0.8 |
| Aug |
| 63 % |
| 62 % |
| +1.0 |
| Sep | 56.4 % | 56.5 % | -0.1 |
| Oct | 79.1 % | 78.6 % | +0.5 |
| Nov | 88.8 % | 87.1 % | +1.7 |
| Dec | 91 % | 90.4 % | +0.6 |