condition mean min max 4 h after light 91.9 91.9 91.9 8 h after light 128.1 80.0 176.2 12 h after light 69.3 58.8 79.8 4 h after dark 54.3 53.4 55.2 8 h after dark 46.85 41.1 52.6 12 h after dark 51.9 38.0 65.8