condition mean min max 0 h after light 15.56865 15.2717 15.8656 4 h after light 11.507295 9.75919 13.2554 8 h after light 10.78585 10.6322 10.9395 4 h after dark 15.59812 8.88814 22.3081 8 h after dark 11.6142 10.0271 13.2013 12 h after dark 22.37595 19.6157 25.1362