condition mean min max 4 h after light 940.1 940.1 940.1 8 h after light 933.75 894.6 972.9 12 h after light 1035.15 957.3 1113.0 4 h after dark 812.7 644.1 981.3 8 h after dark 785.65 739.9 831.4 12 h after dark 778.95 751.6 806.3