condition mean min max 4 h after light 1838.2 1838.2 1838.2 8 h after light 1859.8 1461.4 2258.2 12 h after light 1967.0 1799.6 2134.4 4 h after dark 1596.1 1372.6 1819.6 8 h after dark 1243.15 1035.9 1450.4 12 h after dark 831.3 716.1 946.5