condition mean min max 4 h after light 157.9 157.9 157.9 8 h after light 149.15 142.0 156.3 12 h after light 72.1 67.1 77.1 4 h after dark 155.85 69.5 242.2 8 h after dark 171.7 122.2 221.2 12 h after dark 139.75 126.3 153.2