Bewolking — 2023
| Month | Stoumont | Spa | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 89.6 % | 88.9 % | +0.7 |
| Apr | 68.8 % | 67.4 % | +1.4 |
| May | 64.6 % | 65 % | -0.4 |
| Jun | 43 % | 42.9 % | +0.1 |
| Jul | 65 % | 65.1 % | -0.1 |
| Aug |
| 62.5 % |
| 63 % |
| -0.5 |
| Sep | 57.1 % | 56.4 % | +0.7 |
| Oct | 79.6 % | 79.1 % | +0.5 |
| Nov | 91.6 % | 88.8 % | +2.8 |
| Dec | 91.6 % | 91 % | +0.6 |