Luchtvochtigheid — 1999
| Month | Court-Saint-Étienne | Mont-Saint-Guibert | Difference |
|---|---|---|---|
| Jan | 85.1 % | – | – |
| Feb | 85.5 % | – | – |
| Mar | 81.7 % | – | – |
| Apr | 80.6 % | – | – |
| May | 74.9 % | – | – |
| Jun | 74.9 % | – | – |
| Jul | 70.6 % | – | – |
| Aug | 73.1 % | – | – |
| Sep |
| 76.4 % |
| – |
| – |
| Oct | 81 % | – | – |
| Nov | 85.7 % | – | – |
| Dec | 87.3 % | – | – |