Bewolking — 2021
| Month | Court-Saint-Étienne | Mont-Saint-Guibert | Difference |
|---|---|---|---|
| Jan | 89.6 % | – | – |
| Feb | 66.1 % | – | – |
| Mar | 60.1 % | – | – |
| Apr | 52.5 % | – | – |
| May | 62.9 % | – | – |
| Jun | 64.9 % | – | – |
| Jul | 63.5 % | – | – |
| Aug | 67.5 % | – | – |
| Sep |
| 59 % |
| – |
| – |
| Oct | 67.5 % | – | – |
| Nov | 76.1 % | – | – |
| Dec | 85.3 % | – | – |