condition mean min max 4 h after light 8.886668 8.840083 8.933253 8 h after light 9.116673 9.050361 9.182985 12 h after light 9.4428095 8.718035 10.167584 4 h after dark 9.415295 8.743491 10.087099 8 h after dark 8.5678775 8.191051 8.944704 12 h after dark 10.655886 10.655886 10.655886