Bewolking — 1997
| Month | Court-Saint-Étienne | Ottignies-Louvain-la-Neuve | Difference |
|---|---|---|---|
| Jan | 70 % | – | – |
| Feb | 80.9 % | – | – |
| Mar | 66.9 % | – | – |
| Apr | 57 % | – | – |
| May | 65.2 % | – | – |
| Jun | 72.4 % | – | – |
| Jul | 67.4 % | – | – |
| Aug | 53.1 % | – | – |
| Sep |
| 58.5 % |
| – |
| – |
| Oct | 59.6 % | – | – |
| Nov | 82.3 % | – | – |
| Dec | 87.7 % | – | – |