Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,7967,8685,9766,10180,10745,12249,12984,11919,11022,10297,9725,8008,10303,
1991,8012,9241,10320,10733,10859,12280,13134,13424,11311,11133,9897,9872,10862,
1992,9070,9957,10675,11598,11860,12900,13904,13870,12018,12048,10701,9702,11562,
1993,8962,9796,10993,11887,12050,13472,14969,14857,12682,12412,10964,10474,11974,
1994,10084,10509,11943,12225,13465,14269,15172,15471,13695,12562,11477,11574,12720,
1995,10747,11535,12393,12687,13476,14937,16261,16167,14401,13494,12490,12155,13395,
1996,10374,11767,13143,13054,13757,15457,16710,16707,14457,13530,12533,11600,13591,
1997,11309,12510,13627,13557,14339,15730,17177,16981,14929,14162,13472,12108,14158,
1998,11671,12985,13779,14694,14999,16773,17940,17867,15392,15330,,,,
1999,11915,13300,14689,14803,15620,17326,18709,18566,15966,15108,14366,13350,15310,
2000,12449,13542,14546,14821,15501,16984,18508,18020,15478,15085,13587,13275,15150,
2001,12439,13274,14690,14958,15050,16838,17800,17939,15776,15284,14448,13030,15127,
2002,12389,13903,15050,15012,16347,17416,18511,18862,16044,15664,14428,14286,15659,
2003,13304,13800,14611,15369,16332,17605,19146,19280,15938,15858,14770,12764,15731,
2004,12364,12757,15064,15880,15864,17326,18969,18487,16401,15704,14718,13947,15623,
2005,12323,14003,15302,15315,15912,17476,18976,18393,15688,15087,14142,13728,15529,
2006,12890,13966,15225,15554,15967,17643,18811,18118,16531,15617,14849,14378,15796,
2007,13242,14190,15760,15911,16453,17896,18856,18686,16737,15971,15350,13445,16041,
2008,12718,13569,14990,14962,15753,16430,17687,17142,15192,15098,,13466,,
2009,12973,13849,14526,15407,16501,17507,19576,18342,16553,15626,14817,13537,15768,
2010,12677,14025,14977,15834,16083,17546,19923,18513,16619,15854,14149,13692,15824,
2011,13021,13539,14577,15440,15170,17033,18894,17883,16553,15598,14176,13729,15468,
2012,12599,13521,14540,15309,15885,17064,18693,17818,15984,15377,14256,13414,15372,
2013,12224,13215,14952,15448,16238,17432,19009,18044,15924,15669,14318,13625,15508,
2014,12739,13349,15193,15892,16311,17879,19670,18313,16412,16027,14499,14326,15884,
2015,13650,14845,16343,16911,17510,19157,20767,19456,17994,17133,15643,14814,17019,
2016,13898,15221,16905,17264,18153,20284,21986,20390,18903,17642,16589,14461,17641,
2017,13255,15038,17247,17893,19066,20429,21831,22801,18721,17914,16760,15612,18047,
2018,14629,15362,17859,17983,19260,20920,22628,21271,19475,18444,17274,15828,18411,
2019,14909,14768,17769,18715,19433,21327,23003,21498,19752,18538,17100,16787,18636,
2020,14594,15691,14887,10855,15600,19053,21718,20586,20077,18127,15501,15241,16827,
2021,14931,15355,17994,18695,20395,23238,24498,21963,21167,19671,18653,15797,19363,
2022,15471,16866,18115,18671,19895,21788,22689,21301,20651,19595,17521,16044,19051,
2023,15073,15925,17474,18493, , ,24303,21253,22417,19583,18653,16871,19396,
2024,15033,16963,18152, , , , , , , , , , ,