condition mean min max 4 h after light 2187.9 2187.9 2187.9 8 h after light 2157.25 2121.5 2193.0 12 h after light 1885.65 1670.5 2100.8 4 h after dark 1356.75 1146.6 1566.9 8 h after dark 1106.9 1076.5 1137.3 12 h after dark 1160.75 1036.8 1284.7