Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,7473,8018,8650,9193,9027,9223,9244,9391,9710,9262,9301,8596,8927,
1991,8242,8819,10041,10643,11597,11750,14352,12269,11809,11208,10250,10290,10955,
1992,9977,10029,10398,11102,11712,12066,12085,12684,12611,12133,11216,10489,11410,
1993,9377,10505,11366,12607,13177,13604,13303,13285,13104,12859,11809,11653,12229,
1994,10952,11500,12626,13234,13917,14028,13916,14166,13879,13674,12002,11821,12985,
1995,11778,12554,13449,14584,14900,15370,14780,15309,14345,14393,12946,12256,13889,
1996,11830,12876,13589,14524,15022,14773,13609,11831,12566,14352,13425,14581,13582,
1997,13829,15939,16970,18227,18687,18806,17957,18752,19127,18399,16970,16234,17491,
1998,13233,13316,,,,,,,,,21098,20504,,
1999,20603,21030,22425,23934,24494,26072,25417,25587,26099,27010,24595,24251,24293,
2000,22993,23369,26027,28487,27693,27796,25874,29481,29186,29397,27066,26979,27029,
2001,25516,27447,30252,32529,32038,32232,31350,32099,30875,31320,29234,28098,30249,
2002,27404,29244,29653,32867,35591,31920,32212,32758,31815,32529,30105,29656,31313,
2003,29270,30850,30915,34107,37757,35201,34154,33991,32338,32261,28521,30445,32484,
2004,28176,30667,33002,35162,34948,36041,35200,35001,34934,35010,33115,33453,33726,
2005,31508,33866,35079,36488,36818,37973,36560,37737,35958,35164,33715,33488,35363,
2006,32915,35186,35849,37851,38624,39327,37164,38427,37370,37527,35247,34008,36625,
2007,33550,35113,36232,37875,39024,37837,37214,38404,36387,37349,35296,33528,36484,
2008,32148,34817,35532,37675,38356,37646,36752,36486,36736,35909,33016,32678,35646,
2009,31254,33097,33177,36959,39633,38911,37952,,37299,35502,33420,33319,,
2010,31491,34232,35413,36856,37230,38283,37357,37627,36821,36049,33222,33328,35659,
2011,33028,34116,34327,36445,37697,38248,36590,37526,36948,36393,33108,34083,35709,
2012,32372,34504,34568,37233,38336,37474,36731,37224,36101,34744,32580,32311,35348,
2013,30070,33323,34820,37051,38736,38252,37624,37937,36842,36689,34142,33101,35716,
2014,32339,33501,35380,38002,39131,38960,37873,37770,36432,36087,31919,33412,35901,
2015,32546,35082,35815,37714,39134,38901,37670,38206,37292,37272,34613,34140,36532,
2016,34035,36420,37261,40211,41186,40858,39744,40489,39616,39257,36864,34419,38364,
2017,31628,36477,38441,40943,42297,42282,41186,41355,40275,40006,37823,37516,39186,
2018,36229,37271,38729,41709,43302,42672,41347,42615,41676,41059,39119,38104,40319,
2019,37353,37351,40312,42718,43241,43405,42954,43535,42516,42314,40177,39737,41301,
2020,38405,40873,33918,28181,37084,41400,41130,42063,41387,40265,35384,35984,38006,
2021,35909,37182,39871,42950,44329,45100,43069,42714,40637,40729,38331,40283,40925,
2022,36169,38942,39789,41203,42360,42230,41438,42977,41660,41638,37984,37382,40314,
2023,37736,39336,38963,42380,44196,43555,41807,43692,42786,42165,39632,39687,41328,
2024,36061,40555,40053, , , , , , , , , , ,