condition mean min max 4 h after light 644.5 644.5 644.5 8 h after light 603.25 495.7 710.8 12 h after light 514.0 499.5 528.5 4 h after dark 613.6 428.6 798.6 8 h after dark 662.8499999999999 656.3 669.4 12 h after dark 605.3 582.3 628.3