condition mean min max 4 h after light 8.56304 7.437372 9.688708 8 h after light 8.5675585 8.154237 8.98088 12 h after light 8.855167999999999 8.333905 9.376431 4 h after dark 8.3758035 7.612695 9.138912 8 h after dark 8.8410005 7.753174 9.928827 12 h after dark 7.97144 7.97144 7.97144