condition mean min max 4 h after light 459.9 459.9 459.9 8 h after light 534.2 498.0 570.4 12 h after light 638.0 608.2 667.8 4 h after dark 627.55 577.6 677.5 8 h after dark 573.25 448.4 698.1 12 h after dark 471.05 435.0 507.1