Temperatuur — 1999
| Month | Court-Saint-Étienne | Mont-Saint-Guibert | Difference |
|---|---|---|---|
| Jan | 5.2 °C | – | – |
| Feb | 2.9 °C | – | – |
| Mar | 7.3 °C | – | – |
| Apr | 9.8 °C | – | – |
| May | 14.4 °C | – | – |
| Jun | 15.3 °C | – | – |
| Jul | 19.2 °C | – | – |
| Aug | 18 °C | – | – |
| Sep |
| 17.8 °C |
| – |
| – |
| Oct | 10.8 °C | – | – |
| Nov | 5.9 °C | – | – |
| Dec | 4.3 °C | – | – |