condition mean min max 4 h after light 9.009098 8.862836 9.15536 8 h after light 8.673209 7.679475 9.666943 12 h after light 8.882479499999999 8.609599 9.15536 4 h after dark 9.0771765 8.998993 9.15536 8 h after dark 9.146044 8.656384 9.635704 12 h after dark 10.333757 10.333757 10.333757