condition mean min max 0 h after light 7.09406 6.84727 7.34085 4 h after light 21.59585 19.5434 23.6483 8 h after light 50.6708 48.0978 53.2438 4 h after dark 32.0233 25.7029 38.3437 8 h after dark 17.42485 17.3792 17.4705 12 h after dark 8.41261 5.59842 11.2268