condition mean min max 4 h after light 635.3 635.3 635.3 8 h after light 597.6500000000001 590.2 605.1 12 h after light 546.3 537.6 555.0 4 h after dark 605.6 573.1 638.1 8 h after dark 586.9000000000001 547.2 626.6 12 h after dark 606.6 584.5 628.7