condition mean min max 4 h after light 610.8 610.8 610.8 8 h after light 515.8 506.6 525.0 12 h after light 487.6 401.3 573.9 4 h after dark 623.05 558.9 687.2 8 h after dark 595.3499999999999 556.9 633.8 12 h after dark 535.5999999999999 513.4 557.8