condition mean min max 4 h after light 467.7 467.7 467.7 8 h after light 461.85 461.7 462.0 12 h after light 379.5 376.2 382.8 4 h after dark 474.25 377.4 571.1 8 h after dark 481.35 427.2 535.5 12 h after dark 539.95 522.9 557.0