condition mean min max 4 h after light 483.1 483.1 483.1 8 h after light 484.9 434.7 535.1 12 h after light 504.85 477.1 532.6 4 h after dark 517.75 513.2 522.3 8 h after dark 570.9 484.5 657.3 12 h after dark 519.3 509.7 528.9