condition mean min max 4 h after light 2172.3 2172.3 2172.3 8 h after light 1773.1 1757.6 1788.6 12 h after light 1772.85 1508.9 2036.8 4 h after dark 2163.95 1871.7 2456.2 8 h after dark 2657.85 2310.7 3005.0 12 h after dark 2778.5 2733.0 2824.0