condition mean min max 4 h after light 473.4 473.4 473.4 8 h after light 415.1 400.4 429.8 12 h after light 389.4 376.1 402.7 4 h after dark 495.4 475.8 515.0 8 h after dark 451.5 400.1 502.9 12 h after dark 574.95 533.9 616.0