Year Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec. 24-Hour Annual Avg. 2017 9241 9692 10690 11847 14167 19517 19776 14030 10284 13053 2018 9294 9032 11056 11405 14581 16075 18880 18024 15269 12892 11420 8913 13070 2019 9728 8501 10866 11894 14297 16672 19139 18262 14922 12413 10777 8453 12995 2020 9048 10357 9795 8407 12053 15634 18522 18317 16338 13132 10457 12715 2021 10303 9805 11910 13606 15537 18914 15840 13881 12349 10942 13641 2022 9975 16482 14298 10823 9635 2023 10521 10915 12026 12787 15108 17692 19541 17653 15872 13718 11468 10493 13983 2024 9487 10626