Bewolking — 1998
| Month | Court-Saint-Étienne | Ottignies-Louvain-la-Neuve | Difference |
|---|---|---|---|
| Jan | 68.9 % | – | – |
| Feb | 67.1 % | – | – |
| Mar | 81.8 % | – | – |
| Apr | 83.7 % | – | – |
| May | 62.1 % | – | – |
| Jun | 77.2 % | – | – |
| Jul | 74.2 % | – | – |
| Aug | 55 % | – | – |
| Sep |
| 72.5 % |
| – |
| – |
| Oct | 80.8 % | – | – |
| Nov | 70 % | – | – |
| Dec | 81.2 % | – | – |