Year Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec. 24-Hour Annual Avg. 2011 1009 1062 1453 1697 1945 1807 1702 1602 1214 1083 2012 1045 1072 1040 1283 1568 1775 1932 1740 1644 1589 1225 1069 1415 2013 911 1054 1133 1289 1568 1712 1950 1747 1621 1626 1231 990 1403 2014 955 955 1103 1247 1575 1791 1929 1914 1703 1714 1195 1071 1429 2015 1039 1160 1286 1370 1673 1976 2049 1882 1827 1794 1373 1118 1546 2016 1084 1162 1211 1498 1836 2124 2175 1942 1826 1677 1403 1056 1583 2017 913 1092 1217 1420 1824 2082 2239 2268 1954 1889 1456 1264 1635 2018 1223 1193 1280 1545 1953 2193 2552 2181 2049 2000 1558 1322 1754 2019 1284 1153 1357 1550 1901 2344 2474 2319 2084 1945 1572 1371 1779 2020 1272 1390 1357 1635 2266 2427 2828 2680 2445 2327 1769 1612 2001 2021 1566 1504 1740 1986 2354 2783 2879 2600 2507 2345 1860 1674 2150 2022 1494 1562 1681 1837 2148 2457 2713 2617 2474 2391 1742 1489 2051 2023 1537 1569 1544 1870 2369 2694 2974 2723 2588 2415 1900 1607 2149 2024 1321 1566