Bewolking — 1999
| Month | Mont-Saint-Guibert | Court-Saint-Étienne | Difference |
|---|---|---|---|
| Jan | – | 78.2 % | – |
| Feb | – | 77.4 % | – |
| Mar | – | 78.4 % | – |
| Apr | – | 63.7 % | – |
| May | – | 65.7 % | – |
| Jun | – | 56.5 % | – |
| Jul | – | 53.7 % | – |
| Aug | – | 71.1 % | – |
| Sep |
| – |
| 63.2 % |
| – |
| Oct | – | 61.8 % | – |
| Nov | – | 76.1 % | – |
| Dec | – | 80.1 % | – |