Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,8422,9065,10657,11267,12007,13384,13582,14216,12563,11429,10727,8880,11362,
1991,8421,9707,11273,11332,12181,13626,13990,14854,13072,12215,10918,10604,11863,
1992,9655,10761,12285,12590,13483,14850,15520,15132,13901,12932,11613,10251,12788,
1993,8869,10127,11996,13293,13853,15180,15968,16157,14814,13855,12560,11838,13226,
1994,10304,11019,12938,13229,13877,15249,15637,15810,14628,13506,11912,11703,13332,
1995,11098,11803,13431,13742,14505,15812,16231,16618,15369,14439,13477,12245,14064,
1996,10810,11858,14039,14386,14974,16104,16561,16646,15227,14362,13585,12206,14230,
1997,11836,12623,14519,14334,14972,15961,16337,16531,14828,14740,14031,13312,14502,
1998,11823,13428,14812,15475,15927,17283,17689,18525,16724,15582,14854,13864,15499,
1999,13230,13997,16276,16736,17420,19073,19356,19355,18271,17565,16660,14879,16902,
2000,13597,15316,16762,16968,17660,18956,19204,19877,18261,17374,15983,14866,17069,
2001,13502,14757,17161,17583,18244,19377,19668,20245,18830,17614,16452,14685,17343,
2002,14105,15801,17370,18043,18808,20332,20539,20692,18845,18503,17112,16126,18023,
2003,14970,15535,17362,17942,19076,20487,20716,21096,18393,17618,16593,15925,17976,
2004,13414,15308,17812,18253,18448,19476,20148,20094,18829,18179,16942,16139,17754,
2005,14350,16091,18012,18115,18463,20122,20432,20370,18451,17803,17193,16008,17951,
2006,14972,16354,18043,18520,19099,20932,20852,20973,19717,19101,18171,16719,18621,
2007,15523,16857,19020,19404,19600,20311,,,,,,15745,,
2008,13720,15467,18017,18215,19156,19512,19495,19301,18039,17961,17285,15374,17629,
2009,14428,15929,17861,18537,19427,20798,21289,19101,17270,19221,17938,14026,17985,
2010,12690,,18349,18656,,20884,21724,21737,20509,19658,17907,16161,,
2011,15667,16500,18362,18949,19405,20959,21513,21472,19904,19390,17949,17120,18933,
2012,15471,16659,17828,18895,19853,21444,21541,22028,19963,19356,18504,16890,19036,
2013,14536,16379,18829,19021,20124,21777,21855,21606,20527,19709,18412,16939,19143,
2014,15733,16417,19566,19778,20664,22345,22070,21984,20877,20370,18380,17936,19677,
2015,16638,18505,20854,21028,21993,23948,24106,23458,22703,22181,20577,18625,21218,
2016,17505,19308,21925,22371,23873,25551,25815,25672,24513,23537,22452,18478,22583,
2017,15438,19279,22603,23750,25071,27212,27286,28156,25362,25120,23484,20857,23635,
2018,19581,20668,24297,24399,,28928,28435,27941,26569,25939,24416,21895,24848,
2019,21061,20598,25281,26497,27424,29419,29275,29837,28299,27733,26163,24477,26339,
2020,22713,24533,23915,19885,25355,29102,30178,31094,31434,31078,26857,25606,26813,
2021,25198,24941,30767,32120,33099,35091,35060,33165,32704,32145,31874,27661,31152,
2022,25749,28207,31026,31654,32850,33441,32489,32899,32719,32008,29008,25863,30659,
2023,25540,27031,29440,31265,31421,33009,34276,34747,33184,32732,30899,28216,30980,
2024,24077,28517,30820, , , , , , , , , , ,