condition mean min max 4 h after light 429.7 429.7 429.7 8 h after light 498.6 496.4 500.8 12 h after light 619.8 558.1 681.5 4 h after dark 657.25 646.6 667.9 8 h after dark 720.8 564.4 877.2 12 h after dark 553.05 462.4 643.7