condition mean min max 4 h after light 17.71088 15.504824 19.916936 8 h after light 13.897919 12.377034 15.418804 12 h after light 16.8009125 15.891028 17.710797 4 h after dark 20.304549 13.516771 27.092327 8 h after dark 23.496289 12.523151 34.469427 12 h after dark 31.185461 31.185461 31.185461