Bewolking — 2023
| Month | Herk-de-Stad | Lummen | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 85.4 % | 85.9 % | -0.5 |
| Apr | 68 % | 67.9 % | +0.1 |
| May | 60.9 % | 61.4 % | -0.5 |
| Jun | 40.5 % | 41.6 % | -1.1 |
| Jul | 64.2 % | 64.4 % | -0.2 |
| Aug |
| 61.6 % |
| 62.3 % |
| -0.7 |
| Sep | 57.5 % | 59.1 % | -1.6 |
| Oct | 76.7 % | 77 % | -0.3 |
| Nov | 75.6 % | 75.5 % | +0.1 |
| Dec | 85 % | 85.2 % | -0.2 |