condition mean min max 0 h after light 6.764575 3.86055 9.6686 4 h after light 14.5601 11.4189 17.7013 8 h after light 12.55111 9.82452 15.2777 4 h after dark 15.2037 11.3747 19.0327 8 h after dark 16.22325 15.3368 17.1097 12 h after dark 8.548625 5.78305 11.3142