condition mean min max 4 h after light 52.8 52.8 52.8 8 h after light 47.95 11.4 84.5 12 h after light 48.05 39.9 56.2 4 h after dark 77.6 70.3 84.9 8 h after dark 40.3 13.0 67.6 12 h after dark 67.0 59.9 74.1