condition mean min max 3 h after light 17.1282 15.5634 19.6649 6 h after light 15.950533333333333 11.7045 19.9061 9 h after light 16.159766666666666 14.6955 17.725 12 h after light 19.594 18.2704 21.8277 3 h after dark 18.488 17.4141 19.2683 6 h after dark 14.4929 13.9008 15.2052 9 h after dark 13.244666666666667 11.8261 15.374 12 h after dark 14.89575 14.6388 15.1527