condition mean min max 4 h after light 1258.2 1258.2 1258.2 8 h after light 1407.9 1317.4 1498.4 12 h after light 1612.75 1534.0 1691.5 4 h after dark 1989.5 1825.5 2153.5 8 h after dark 2179.6 2087.6 2271.6 12 h after dark 1891.15 1749.8 2032.5