condition mean min max 4 h after light 1847.6 1847.6 1847.6 8 h after light 1402.6 1174.4 1630.8 12 h after light 781.0 466.3 1095.7 4 h after dark 580.3 505.7 654.9 8 h after dark 732.5 590.4 874.6 12 h after dark 868.2 735.3 1001.1