condition mean min max 0 h after light 19.5837 18.915 20.2524 4 h after light 24.51315 22.3237 26.7026 8 h after light 23.82915 23.2146 24.4437 4 h after dark 23.40475 20.506 26.3035 8 h after dark 27.29465 27.122 27.4673 12 h after dark 21.92935 21.2423 22.6164