condition mean min max 0 h after light 18.48655 17.673 19.3001 4 h after light 17.1008 16.152 18.0496 8 h after light 16.62135 16.5547 16.688 4 h after dark 18.990299999999998 18.236 19.7446 8 h after dark 17.63695 17.4196 17.8543 12 h after dark 17.9754 17.8319 18.1189