condition mean min max 4 h after light 606.4 606.4 606.4 8 h after light 640.25 506.4 774.1 12 h after light 655.3 560.0 750.6 4 h after dark 556.75 519.4 594.1 8 h after dark 671.2 589.7 752.7 12 h after dark 635.05 534.3 735.8