condition mean min max 4 h after light 1938.1 1938.1 1938.1 8 h after light 1918.5500000000002 1852.7 1984.4 12 h after light 1793.8 1776.6 1811.0 4 h after dark 1848.15 1721.2 1975.1 8 h after dark 1820.1 1788.1 1852.1 12 h after dark 1760.35 1743.1 1777.6