condition mean min max 4 h after light 7.622015 7.45183 7.7922 8 h after light 9.70792 8.28914 11.1267 12 h after light 9.571805000000001 8.57741 10.5662 4 h after dark 13.85015 13.8354 13.8649 8 h after dark 11.555900000000001 11.4779 11.6339 12 h after dark 7.65706 7.05635 8.25777