condition mean min max 4 h after light 168.1 168.1 168.1 8 h after light 97.65 96.0 99.3 12 h after light 49.25 16.8 81.7 4 h after dark 301.7 144.6 458.8 8 h after dark 258.1 235.6 280.6 12 h after dark 148.9 136.9 160.9