condition mean min max 4 h after light 10.571494 9.605514 11.537474 8 h after light 8.326473 7.887207 8.765739 12 h after light 8.814753 8.611069 9.018437 4 h after dark 8.8362585 8.456534 9.215983 8 h after dark 8.736968999999998 8.188239 9.285699 12 h after dark 9.166755 9.166755 9.166755