Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
2011,,15809,16563,17453,17657,17648,17020,17108,17080,16939,15212,14815,,
2012,14001,15343,15338,16165,16690,16926,16299,16800,16943,16865,15915,15616,16075,
2013,14451,16072,16575,16954,17739,17817,16962,17334,17383,17161,16221,15497,16681,
2014,14824,16009,16933,17642,18162,18178,17305,17428,17629,17358,16042,16070,16965,
2015,15494,17139,17501,18027,18330,18129,17743,17817,17965,17838,16805,16259,17421,
2016,15573,17118,17591,18453,19120,18996,18307,18518,18686,18347,17541,16289,17878,
2017,14976,16937,18261,19082,19728,19505,18875,19186,18904,18496,17591,17138,18223,
2018,16404,17533,18725,18891,19376,19373,18813,19121,19163,18985,17900,17181,18455,
2019,16834,17329,18824,19745,20092,20172,19278,19671,19670,19319,18285,17763,18915,
2020,17290,18421,17049,15054,18036,19113,18633,18947,19579,19553,17433,17233,18029,
2021,17151,17585,20157,20825,21176,21251,20257,19535,19940,20069,19803,19427,19765,
2022,17387,18561,19424,20082,20682,20090,19373,19644,19923,20092,18064,17295,19218,
2023,17414,18324,18768,20101,21081,20645,20003,20275,20373,20192,18895,18244,19526,
2024,16798,18910,19784, , , , , , , , , , ,