Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,8463,8800,10794,11041,11634,13045,13304,13932,12270,11233,10569,8509,11145,
1991,8173,8499,11072,11153,11776,13189,13220,13703,12059,11892,10730,10429,11343,
1992,9655,10366,12077,12777,13595,14263,14921,15479,13727,12689,11485,9979,12626,
1993,8547,9785,11584,12884,13491,14732,15530,15788,14376,13523,12189,11458,12841,
1994,10403,10058,12840,13199,13821,15399,15791,16140,16506,14653,11895,11794,13562,
1995,11099,11943,13583,13902,14740,15625,15605,17064,15778,14475,13810,12405,14169,
1996,10887,11718,14335,14407,15203,16560,17103,17470,15953,15416,14008,12722,14649,
1997,12113,13200,15443,14912,15821,17042,17628,18063,16263,15440,14485,12567,15248,
1998,12789,12889,12735,13575,,18105,17155,18075,17297,15311,,,,
1999,,,,,,,,,,,16183,14392,,
2000,13114,14795,16163,16353,17111,18388,18697,19385,17730,16893,15518,14387,16545,
2001,13090,14245,16612,17042,17759,18936,19265,19830,18482,17456,16317,14297,16944,
2002,13691,15348,16897,17527,18925,19914,20069,19889,18619,18186,16294,17749,17759,
2003,,16344,18031,17581,18379,20222,20501,20858,18946,18511,16386,15954,,
2004,13388,15288,17913,18407,18834,19806,20586,20579,19283,18598,17115,16227,18002,
2005,14316,16201,18197,18311,18756,20575,20663,20862,18835,18242,17458,16153,18214,
2006,15090,16513,18286,18813,19421,21427,21215,21464,20198,19593,18476,17058,18963,
2007,15773,17086,19302,19699,20014,21130,20620,21650,20202,19258,18396,16162,19108,
2008,14199,15706,17741,17925,18792,19205,19450,19657,18325,17917,16518,14551,17499,
2009,14204,15690,17613,18304,19210,20618,21125,20673,19961,18878,17717,15730,18310,
2010,14892,16328,18241,18614,19142,20486,,,,19730,,15801,,
2011,15327,16162,17995,18536,18990,20564,21069,21143,19575,19125,17663,16796,18579,
2012,15167,16303,17635,18539,19378,20912,21208,21715,19452,19072,18153,16673,18684,
2013,14531,16057,18494,18629,19655,21352,21453,21761,20374,19463,18047,16589,18867,
2014,15399,15996,19145,19394,20208,21978,21782,21802,20368,20013,17983,17555,19302,
2015,16337,18106,20371,20596,21601,23739,23724,23362,22371,21757,20189,18210,20864,
2016,17058,18945,21495,21989,23537,25145,25364,25242,24086,23082,22093,18274,22192,
2017,15525,18896,22156,23353,24593,26672,26926,27749,25142,25013,23286,20998,23359,
2018,19280,20379,24117,24285,24905,26633,27553,27213,25873,25394,24108,21468,24267,
2019,20451,20021,24522,25703,26751,28586,28675,29097,27930,27531,25611,23816,25724,
2020,22489,23853,23408,19201,24907,28353,29686,30282,30619,30244,26251,24934,26185,
2021,24530,24165,30582,31279,32136,33967,34035,31268,32102,31659,31044,26610,30281,
2022,25230,22523,30464,31104,32331,33212,32576,32779,32266,31518,28487,25339,29819,
2023,25031,26552,28970,31346,33187,35048,34706,34293,32760,32120,30396,27666,31006,
2024,23611,27956,30244, , , , , , , , , , ,