condition mean min max 4 h after light 501.9 501.9 501.9 8 h after light 470.65 458.6 482.7 12 h after light 572.9 495.8 650.0 4 h after dark 529.85 435.7 624.0 8 h after dark 458.3 442.1 474.5 12 h after dark 398.75 324.3 473.2