Bewolking — 1999
| Month | Rijkevorsel | Merksplas | Difference |
|---|---|---|---|
| Jan | 76.7 % | 76.7 % | +0.0 |
| Feb | 76.9 % | 76.9 % | +0.0 |
| Mar | 77.7 % | 77.7 % | +0.0 |
| Apr | 62 % | 62 % | +0.0 |
| May | 68 % | 68 % | +0.0 |
| Jun | 57 % | 57 % | +0.0 |
| Jul | 54 % | 54 % | +0.0 |
| Aug |
| 71.6 % |
| 71.6 % |
| +0.0 |
| Sep | 62.4 % | 62.4 % | +0.0 |
| Oct | 63.3 % | 63.3 % | +0.0 |
| Nov | 77 % | 77 % | +0.0 |
| Dec | 79.8 % | 79.8 % | +0.0 |