Bewolking — 2023
| Month | Spa | Theux | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 88.9 % | 87.5 % | +1.4 |
| Apr | 67.4 % | 67.7 % | -0.3 |
| May | 65 % | 64.4 % | +0.6 |
| Jun | 42.9 % | 42.4 % | +0.5 |
| Jul | 65.1 % | 66.1 % | -1.0 |
| Aug |
| 63 % |
| 62.1 % |
| +0.9 |
| Sep | 56.4 % | 56.1 % | +0.3 |
| Oct | 79.1 % | 78.1 % | +1.0 |
| Nov | 88.8 % | 84.4 % | +4.4 |
| Dec | 91 % | 88.9 % | +2.1 |