Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,16354,17438,19891,20770,19800,20091,18936,19408,18269,18517,19685,18518,18978,
1991,18518,19773,20334,21125,22693,21130,20706,21514,19980,20283,18868,18648,20302,
1992,18830,19809,20538,21791,21211,20994,20334,20563,20754,20612,19017,18827,20327,
1993,17944,19791,20849,22013,21597,21959,21247,22186,19845,20025,19871,21234,20719,
1994,19629,20800,23114,23041,23182,22840,21805,23473,22638,22799,22426,22459,22359,
1995,21904,23542,26206,26581,25832,27981,25480,25839,25527,24553,23494,24556,25125,
1996,23775,23673,24838,22237,21977,23283,21707,22008,22968,23936,22033,20170,22717,
1997,19479,23026,20791,21369,21623,21936,20603,21082,20785,20607,19733,19648,20890,
1998,18796,20311,20999,21967,21758,22152,21066,21306,20409,19355,18465,19960,20545,
1999,19028,19337,19003,19554,19569,21458,22661,23604,23553,23765,23100,23860,21541,
2000,23621,25100,25862,26939,26978,27489,26077,26867,26346,26123,25055,25319,25981,
2001,23930,25570,26442,27539,27690,25632,23956,25422,26535,26751,25946,25187,25883,
2002,25219,26626,26704,29010,28739,28735,27942,27947,26813,26884,25545,25190,27113,
2003,25274,26422,26249,27931,28387,28613,27699,27396,27308,27405,25196,25771,26971,
2004,24111,25512,26622,28103,26909,,,,,25491,25160,25452,,
2005,23773,25938,26787,27528,28043,28261,26537,27782,26649,26085,25318,25057,26480,
2006,24740,26120,26734,27528,28498,28795,24773,26918,26234,26145,25448,24824,26396,
2007,24122,25155,26922,26798,28184,28082,26623,27486,26134,26619,25336,24225,26307,
2008,23482,25061,25189,26723,26739,26107,25064,24974,25020,24799,23253,23445,24988,
2009,22885,24294,24414,26628,29043,27002,25609,25103,25333,24720,23581,23464,25173,
2010,22692,24376,25301,26011,25599,26134,25049,25464,25367,24517,22919,24060,24791,
2011,23341,24248,24787,25938,25850,26057,24713,24641,24803,24439,23077,23490,24615,
2012,22739,24235,24348,26030,25389,25954,24797,25219,25323,24875,23478,23364,24646,
2013,21767,23861,24866,25878,26108,25825,24777,25601,25192,24743,23227,22433,24523,
2014,22128,23130,24157,25506,25689,25594,24169,24851,24613,24395,22109,22848,24099,
2015,22411,24122,24604,25604,25402,25400,24515,24765,24594,24117,23282,23309,24344,
2016,23140,24420,24919,26606,26234,25823,24355,25200,24598,24139,23005,21780,24518,
2017,19929,22886,24021,25439,25668,25364,24449,24916,24388,24192,22797,22339,23866,
2018,21944,22161,21782,19940,19846,19676,18681,19226,18821,18377,18957,18964,19865,
2019,18906,19252,20502,22039,22007,22249,21469,22732,22403,21966,20969,20612,21259,
2020,20384,21659,18351,15350,19127,21018,20671,21189,21208,21218,19145,19056,19865,
2021,19166,20011,21287,22103,22429,22518,21341,21847,21391,20804,20409,19979,21107,
2022,19115,20883,21637,22691,22816,23585,21733,22385,22045,22170,19737,19767,21547,
2023,20539,21392,21473,23720,24306,23630,22772,23429,22925,22843,21426,20981,22453,
2024,19695,22070,22719, , , , , , , , , , ,