condition mean min max 4 h after light 794.4 794.4 794.4 8 h after light 735.3 679.0 791.6 12 h after light 1082.85 708.9 1456.8 4 h after dark 2037.2 1383.6 2690.8 8 h after dark 1889.35 1847.4 1931.3 12 h after dark 1678.1 1675.3 1680.9