condition mean min max 4 h after light 684.4 684.4 684.4 8 h after light 575.5 428.5 722.5 12 h after light 470.05 382.1 558.0 4 h after dark 633.45 617.4 649.5 8 h after dark 678.95 535.5 822.4 12 h after dark 745.0 695.7 794.3