condition mean min max 4 h after light 3.024465 2.72582 3.32311 8 h after light 3.25074 2.94367 3.55781 12 h after light 3.81872 3.68283 3.95461 4 h after dark 5.28545 4.97601 5.59489 8 h after dark 4.788055 4.51289 5.06322 12 h after dark 4.131005 3.32747 4.93454