condition mean min max 4 h after light 753.9 753.9 753.9 8 h after light 539.25 506.3 572.2 12 h after light 692.1 551.2 833.0 4 h after dark 765.35 764.0 766.7 8 h after dark 909.8 882.0 937.6 12 h after dark 881.5 790.0 973.0