condition mean min max 4 h after light 8.999746 8.958489 9.041003 8 h after light 8.293339 8.077825 8.508853 12 h after light 7.602774 7.385093 7.820455 4 h after dark 9.796421 7.85068 11.742162 8 h after dark 8.966828 8.955493 8.978163 12 h after dark 8.665379 8.665379 8.665379