condition mean min max 4 h after light 8.59852 8.55267 8.64437 8 h after light 6.27012 6.1682 6.37204 12 h after light 8.687425 8.33973 9.03512 4 h after dark 15.650066666666667 15.1804 16.242 8 h after dark 14.822899999999999 12.8011 16.2382 12 h after dark 15.062166666666666 13.8885 17.2762