condition mean min max 4 h after light 7.3903365 7.290664 7.490009 8 h after light 7.164599 6.839189 7.490009 12 h after light 7.51889 7.325196 7.712584 4 h after dark 7.1609425 6.831876 7.490009 8 h after dark 7.8568765 7.712584 8.001169 12 h after dark 7.986423 7.986423 7.986423