condition mean min max 4 h after light 668.3 668.3 668.3 8 h after light 649.55 644.2 654.9 12 h after light 686.65 684.5 688.8 4 h after dark 731.6500000000001 718.1 745.2 8 h after dark 745.0 738.5 751.5 12 h after dark 701.65 660.5 742.8