condition mean min max 4 h after light 705.9 705.9 705.9 8 h after light 687.3 622.7 751.9 12 h after light 607.15 576.9 637.4 4 h after dark 666.2 601.3 731.1 8 h after dark 725.65 585.5 865.8 12 h after dark 760.5 698.1 822.9