condition mean min max 4 h after light 1137.9 1137.9 1137.9 8 h after light 1151.35 1085.0 1217.7 12 h after light 1322.65 1289.2 1356.1 4 h after dark 1677.3 1366.5 1988.1 8 h after dark 1861.15 1743.0 1979.3 12 h after dark 1687.85 1556.4 1819.3