condition mean min max 4 h after light 1954.4 1954.4 1954.4 8 h after light 1659.1 1593.4 1724.8 12 h after light 1414.0 1394.2 1433.8 4 h after dark 1578.1999999999998 1149.6 2006.8 8 h after dark 1719.15 1568.2 1870.1 12 h after dark 1609.65 1443.0 1776.3