condition mean min max 4 h after light 650.1 650.1 650.1 8 h after light 541.25 474.6 607.9 12 h after light 472.55 423.9 521.2 4 h after dark 527.85 436.8 618.9 8 h after dark 612.65 528.8 696.5 12 h after dark 594.9 491.5 698.3