Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,6780,7151,7843,8018,8645,9079,9292,9424,8790,8436,7672,6613,8151,
1991,6594,7402,7647,8008,8569,9087,9441,9809,9124,8887,7955,7681,8356,
1992,7063,7959,8226,8297,9111,9667,9821,9623,9247,9251,8198,7688,8705,
1993,6772,7837,8369,8843,9429,10097,10523,10861,10254,9918,9069,8699,9230,
1994,8094,8235,8610,9260,9939,10043,10304,10546,10031,9583,8681,8332,9312,
1995,7953,8582,,8817,9762,10318,10676,11066,10504,9847,9248,8516,,
1996,7223,8030,9051,9471,9990,10550,10814,11278,10836,,9406,8363,,
1997,7958,9262,9345,9951,10522,10847,11438,11680,10805,10615,10028,9342,10149,
1998,8394,9584,9850,10182,10764,10650,11466,11241,10933,10889,10115,9345,10284,
1999,8993,9563,10084,10648,11031,11374,11779,11812,11513,11112,10406,9401,10643,
2000,9046,9769,9925,10430,11140,11231,11270,11348,10507,10517,9898,9017,10342,
2001,8659,9442,9806,10175,11139,11076,11352,11899,11054,10744,10236,9211,10399,
2002,8926,9692,9730,10408,11363,11390,11712,12111,11326,11171,10438,9854,10677,
2003,9283,9862,9598,10345,11280,11641,11556,11267,10972,11042,9971,9677,10541,
2004,8654,9752,9991,10164,10779,11263,11644,11610,11047,10770,10116,9724,10460,
2005,8903,9981,10025,10109,10721,11274,11370,11685,10746,10373,9955,9414,10380,
2006,9098,9780,10012,10144,10661,11236,11031,10565,10050,10722,10674,9559,10294,
2007,8848,9476,9999,9249,10808,10876,11062,11380,10415,10688,10105,8993,10158,
2008,8519,9121,,9636,10384,10320,10520,10755,,10883,10190,8837,,
2009,8574,9605,9618,10159,10843,10977,10990,11556,11339,11036,10341,9651,10391,
2010,9196,9999,9930,10048,,11187,,,11562,11174,9910,9788,,
2011,9198,9312,9670,10179,10539,11095,11292,11845,11395,10861,,9330,10499,
2012,8448,9639,9569,9920,10709,10876,11113,11785,10939,10573,10039,9305,10243,
2013,8594,9672,9912,10134,10881,11051,11220,11610,10829,10838,9940,9097,10315,
2014,8956,9290,9808,10446,11136,11463,11776,12064,11599,11376,10455,9707,10673,
2015,9288,9977,10392,11758,12785,13065,13196,12631,11718,11466,10436,9711,11369,
2016,9418,10294,10447,11178,11728,12154,12278,12945,12001,11566,11289,9565,11239,
2017,9176,9945,10416,11089,11856,,11847,12169,11314,11578,10704,9798,10989,
2018,9480,9859,10388,10936,11782,12231,12138,12409,11756,11580,10856,9930,11112,
2019,9737,9099,10404,10855,11500,12018,11973,12236,11551,11490,10810,10093,10981,
2020,9436,10191,9113,7936,10200,11565,11744,12408,11790,11207,10044,9659,10441,
2021,9967,9467,10890,11563,12258,12667,12575,12405,11817,11714,10811,10302,11370,
2022,9037,10065,10447,10869,11651,11763,11836,12365,11852,11731,10331,9451,10950,
2023,9866,10234,10710,11069,12089,12320,12003,12278,11672,11590,10450,9713,11166,
2024,8652,9750,10193, , , , , , , , , , ,