condition mean min max 4 h after light 537.8 537.8 537.8 8 h after light 540.85 426.3 655.4 12 h after light 536.6 499.8 573.4 4 h after dark 581.45 423.8 739.1 8 h after dark 434.45 337.4 531.5 12 h after dark 425.35 406.1 444.6