condition mean min max 4 h after light 830.2 830.2 830.2 8 h after light 867.35 855.5 879.2 12 h after light 979.45 766.7 1192.2 4 h after dark 983.5 932.5 1034.5 8 h after dark 894.8 812.9 976.7 12 h after dark 807.95 796.0 819.9