condition mean min max 4 h after light 946.8 946.8 946.8 8 h after light 699.55 597.6 801.5 12 h after light 676.0 610.1 741.9 4 h after dark 692.6 669.2 716.0 8 h after dark 665.5 552.8 778.2 12 h after dark 643.45 610.4 676.5