Zonneschijn — 1997
| Month | Châtelet | Aiseau-Presles | Difference |
|---|---|---|---|
| Jan | 144.9 uren | – | – |
| Feb | 125.3 uren | – | – |
| Mar | 216.5 uren | – | – |
| Apr | 284.3 uren | – | – |
| May | 336.4 uren | – | – |
| Jun | 309 uren | – | – |
| Jul | 341.9 uren | – | – |
| Aug | 342.4 uren | – | – |
| Sep |
| 290.2 uren |
| – |
| – |
| Oct | 206.3 uren | – | – |
| Nov | 109.5 uren | – | – |
| Dec | 69.4 uren | – | – |