Zonneschijn — 1999
| Month | Manhay | Ferrières | Difference |
|---|---|---|---|
| Jan | – | 82.2 uren | – |
| Feb | – | 137.5 uren | – |
| Mar | – | 209.5 uren | – |
| Apr | – | 271.4 uren | – |
| May | – | 329.7 uren | – |
| Jun | – | 365.9 uren | – |
| Jul | – | 354.4 uren | – |
| Aug | – | 304.6 uren | – |
| Sep |
| – |
| 257 uren |
| – |
| Oct | – | 205 uren | – |
| Nov | – | 134.6 uren | – |
| Dec | – | 77.3 uren | – |