Zonneschijn — 1999
| Month | Châtelet | Aiseau-Presles | Difference |
|---|---|---|---|
| Jan | 109.2 uren | – | – |
| Feb | 153.9 uren | – | – |
| Mar | 220.5 uren | – | – |
| Apr | 278.1 uren | – | – |
| May | 343.4 uren | – | – |
| Jun | 370.8 uren | – | – |
| Jul | 358 uren | – | – |
| Aug | 325.4 uren | – | – |
| Sep |
| 262.7 uren |
| – |
| – |
| Oct | 223.3 uren | – | – |
| Nov | 144.6 uren | – | – |
| Dec | 92.3 uren | – | – |