condition mean min max 4 h after light 8.4 8.4 8.4 8 h after light 20.3 12.5 28.1 12 h after light 107.1 84.5 129.7 4 h after dark 72.25 65.8 78.7 8 h after dark 57.2 51.9 62.5 12 h after dark 19.5 8.5 30.5