condition mean min max 4 h after light 1773.2227275 1574.047218 1972.398237 8 h after light 2103.3996545 2002.41283 2204.386479 12 h after light 1820.177453 1803.661311 1836.693595 4 h after dark 1680.1375335 1558.152831 1802.122236 8 h after dark 1521.5425169999999 1483.297045 1559.787989 12 h after dark 1364.933994 1364.933994 1364.933994