Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,11450,12294,13144,13256,15335,16119,13587,13710,12568,13066,12470,11350,13199,
1991,11627,12548,13073,13682,13712,13703,12748,12875,12501,15091,14403,13126,13260,
1992,12898,13819,17200,17618,17651,17887,16668,15323,14857,14981,14193,13935,15632,
1993,11437,13049,16247,16655,16655,16126,16212,15132,15444,15700,15812,15698,15359,
1994,13883,14727,16139,16315,16554,17127,16486,16558,16425,16287,15585,15040,15932,
1995,15287,16182,16760,17274,17262,17538,16602,17262,18569,17539,16928,16068,16939,
1996,,,,,,,,,15607,15015,16405,16543,,
1997,16614,17524,18597,19241,19888,20448,19110,18940,18474,18056,18093,17849,18570,
1998,17024,18664,19147,19528,19307,20006,19683,19642,19665,19637,19590,16721,19051,
1999,18962,19097,20387,20970,21147,21368,20783,21310,21102,21514,20314,19547,20542,
2000,19031,20402,20943,21924,21913,21743,21624,23652,22026,21788,20739,20231,21335,
2001,23310,20675,22806,22526,22452,22070,22315,21983,21071,21119,20253,19405,21665,
2002,23832,26466,27135,28502,28559,27851,27463,28208,27656,28218,26951,25953,27233,
2003,24187,20938,20810,21714,22008,22668,21282,21534,21183,21381,20230,20299,21520,
2004,19145,20665,21951,22910,23658,22097,21846,22862,22928,21420,21533,21679,21891,
2005,20826,25751,23850,22875,23023,23258,25180,27395,22673,22795,22499,22208,23528,
2006,21919,23989,28555,31657,32256,31786,30102,28091,26869,26608,25773,21856,27455,
2007,19206,20710,21128,21129,20638,19992,,21180,20465,20928,20043,19053,,
2008,17863,19916,20074,20979,20625,19509,19413,19596,,18739,18217,18077,,
2009,17494,19083,19031,19460,20734,19856,19078,18940,19261,19318,18780,18485,19127,
2010,17923,19676,20140,20185,19718,19925,19220,19779,19772,19578,18938,18652,19459,
2011,19516,20918,20390,20361,20670,20202,19561,19795,,,17836,18864,19811,
2012,17967,19632,19641,20328,20306,20047,19529,20238,20282,20790,20036,19600,19866,
2013,17907,20459,21117,21726,21631,21267,20439,21198,21120,21481,20702,19971,20752,
2014,19742,21113,22200,22780,22490,21604,20601,21638,21790,22510,20884,22097,21621,
2015,21138,23110,23501,24536,24374,24160,23491,24474,24212,24592,23524,23438,23712,
2016,22982,24684,24934,25562,26009,25739,24742,25494,25696,26716,25483,23558,25133,
2017,19446,24945,25857,26656,26581,25469,25406,26420,26223,26685,25997,25602,25441,
2018,25062,26034,26838,27279,27026,28073,26890,27321,27474,27507,26102,25907,26793,
2019,25413,26147,28994,30688,30210,29845,29218,30143,29564,28594,26042,25617,28373,
2020,24854,26495,22970,18953,23236,25121,24172,23722,23501,22882,20693,20500,23092,
2021,20660,20379,22014,21862,24194,26106,26109,27078,26897,27401,26504,25940,24595,
2022,25258,27810,28108,28662,30022,27935,26089,27780,27755,28561,26644,26326,27579,
2023,26343,28131,28094,29512,29539,29149,28645,30018,29599,30125,28708,28139,28834,
2024,25561,29438,29765,30775, , , , , , , , , ,