Bewolking — 2020
| Month | Olen | Westerlo | Difference |
|---|---|---|---|
| Jan | 76 % | 74.9 % | +1.1 |
| Feb | 74.8 % | 75.5 % | -0.7 |
| Mar | 52.6 % | 53.5 % | -0.9 |
| Apr | 32.7 % | 33.5 % | -0.8 |
| May | 48.5 % | 48.5 % | +0.0 |
| Jun | 64.3 % | 62.9 % | +1.4 |
| Jul | 62.6 % | 61.4 % | +1.2 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |