condition mean min max 4 h after light 67.5 67.5 67.5 8 h after light 66.85 63.5 70.2 12 h after light 85.7 71.5 99.9 4 h after dark 129.55 75.9 183.2 8 h after dark 153.25 150.9 155.6 12 h after dark 169.85 153.0 186.7