Bewolking — 2009
| Month | Ottignies-Louvain-la-Neuve | Court-Saint-Étienne | Difference |
|---|---|---|---|
| Jan | – | 65.7 % | – |
| Feb | – | 86.6 % | – |
| Mar | – | 67.6 % | – |
| Apr | – | 55.7 % | – |
| May | – | 63.5 % | – |
| Jun | – | 59.6 % | – |
| Jul | – | 61.1 % | – |
| Aug | – | 53.5 % | – |
| Sep |
| – |
| 60.5 % |
| – |
| Oct | – | 74 % | – |
| Nov | – | 78.7 % | – |
| Dec | – | 75.4 % | – |