Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,7648,8240,9440,10029,9875,10854,11935,11568,11101,9711,9050,7767,9775,
1991,7588,8890,9584,10038,10242,10892,12260,12032,10890,9797,9111,9069,10040,
1992,8657,9441,10093,11080,10786,12324,13344,13169,12286,11485,10049,9398,11043,
1993,8267,9258,10719,11422,11289,12796,13349,13905,12844,11713,10651,9927,11356,
1994,9718,10003,11481,11850,11849,13117,14320,14051,13182,11827,10820,10304,11888,
1995,9990,10903,11281,12163,12229,13263,14692,14360,13824,12434,11517,11199,12321,
1996,9335,10786,11939,12892,12313,13864,15207,14886,13576,12444,11452,10077,12398,
1997,10236,11324,12300,12739,12841,14735,16199,16292,14971,14029,13084,12241,13416,
1998,11447,12497,13439,14219,14111,16076,17235,17296,15732,14860,13483,12557,14413,
1999,11943,12857,14383,14790,14624,15830,17331,17107,15717,14670,13576,12456,14607,
2000,11813,12967,13911,14311,14562,15850,17453,17189,15604,14776,13200,12785,14535,
2001,12165,12991,14168,14916,15050,16280,17501,17326,16533,15541,14661,13288,15035,
2002,12758,14133,15267,15712,16422,17704,19390,19177,17872,17108,15900,15126,16381,
2003,14635,15301,15975,17126,17780,18974,20207,20355,19144,18740,16383,15809,17536,
2004,14756,15989,17764,18201,17967,19931,21686,20929,20052,18667,17559,16683,18349,
2005,15118,17143,18035,18464,18710,20559,21664,21511,19193,18197,17411,16550,18546,
2006,15791,17287,18334,18898,19139,20991,21953,21371,21036,19833,18585,17892,19259,
2007,16984,18219,19854,19619,20449,21844,22748,21678,21701,20706,19159,17012,19998,
2008,17661,16909,17881,18887,19358,20287,20856,19270,19703,18801,17295,15678,18549,
2009,16138,17061,17447,18887,20101,21823,23458,20749,21502,19672,18069,17289,19350,
2010,16702,17750,18619,,,,,,,,,,,
2011,,,,,,,,17962,20531,18903,17333,16847,,
2012,16465,17021,17418,18859,19809,21539,23155,20807,20942,19256,17957,16727,19163,
2013,16377,17359,18514,19363,20609,22240,23470,21209,20664,19774,18290,17269,19595,
2014,17146,17871,18854,20151,20943,23110,24526,21928,21975,21167,18733,18201,20384,
2015,18497,19821,20807,21868,22795,25752,26777,23771,24233,23204,21108,19751,22365,
2016,19761,21101,22049,22573,23883,26301,27650,24560,24900,23600,21955,19034,23114,
2017,19575,21176,22679,23714,25653,27109,28876,26714,26064,24698,22726,21002,24165,
2018,21262,22027,22870,,26045,28143,29723,26961,27247,25888,23539,21969,25043,
2019,22221,21874,24213,25696,27042, , , , , ,15971,16021,21863,
2020,15217,16192,15166,13120,16420,18934,20168,19827,20386,18824,16701,16071,17252,
2021,16529,16899,18366,19236,20098,21850, ,20620,20978,20047,18684,18176,19308,
2022,17176,18238,18499,19079,19852,20760,21109,20231,20651,20091,17669,16225,19132,
2023,16974,17378,17663,18997,20165,21451,22238,20939,20990,20499,18917,17370,19465,
2024,16858,18002,18408, , , , , , , , , , ,