condition mean min max 4 h after light 9.521564999999999 8.96323 10.0799 8 h after light 14.1898 13.6848 14.6948 12 h after light 15.5796 15.0558 16.1034 4 h after dark 18.34545 16.7501 19.9408 8 h after dark 13.91685 13.687 14.1467 12 h after dark 12.045449999999999 11.5388 12.5521