condition mean min max 4 h after light 16.418017 15.283596 17.552438 8 h after light 13.0155855 11.871561 14.15961 12 h after light 13.9423785 12.847468 15.037289 4 h after dark 14.557893 14.15961 14.956176 8 h after dark 15.886453 11.866156 19.90675 12 h after dark 13.430665 13.430665 13.430665