Neerslag — 1999
| Month | Mont-Saint-Guibert | Court-Saint-Étienne | Difference |
|---|---|---|---|
| Jan | – | 86.1 mm | – |
| Feb | – | 63.6 mm | – |
| Mar | – | 64.8 mm | – |
| Apr | – | 64 mm | – |
| May | – | 69.7 mm | – |
| Jun | – | 61.4 mm | – |
| Jul | – | 36.8 mm | – |
| Aug | – | 73.3 mm | – |
| Sep |
| – |
| 58.2 mm |
| – |
| Oct | – | 39.8 mm | – |
| Nov | – | 23.9 mm | – |
| Dec | – | 123.8 mm | – |