Bewolking — 2020
| Month | Grez-Doiceau | Wavre | Difference |
|---|---|---|---|
| Jan | 72 % | 72.3 % | -0.3 |
| Feb | 75.9 % | 75.7 % | +0.2 |
| Mar | 54.6 % | 54.5 % | +0.1 |
| Apr | 34 % | 33.7 % | +0.3 |
| May | 48.4 % | 48.7 % | -0.3 |
| Jun | 62.5 % | 63.1 % | -0.6 |
| Jul | 61.2 % | 61.3 % | -0.1 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |