condition mean min max 4 h after light 197.4 197.4 197.4 8 h after light 126.55 120.1 133.0 12 h after light 69.45 59.2 79.7 4 h after dark 33.15 31.8 34.5 8 h after dark 50.45 34.9 66.0 12 h after dark 78.3 66.1 90.5