Bewolking — 2017
| Month | Court-Saint-Étienne | Mont-Saint-Guibert | Difference |
|---|---|---|---|
| Jan | 62.2 % | – | – |
| Feb | 77.7 % | – | – |
| Mar | 67.9 % | – | – |
| Apr | 61.6 % | – | – |
| May | 65 % | – | – |
| Jun | 57.2 % | – | – |
| Jul | 71.1 % | – | – |
| Aug | 70.8 % | – | – |
| Sep |
| 64.3 % |
| – |
| – |
| Oct | 69.7 % | – | – |
| Nov | 71.9 % | – | – |
| Dec | 85.2 % | – | – |