Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,5448,5522,7022,7594,8145,9341,10649,11181,9504,7988,7269,6687,8045,
1991,5951,6011,7634,8245,8822,10057,11465,11924,10135,8513,7745,7125,8653,
1992,6341,7296,8004,8657,9967,11081,13359,13668,11619,9360,8436,7482,9641,
1993,6928,7666,8299,9115,10519,11774,13982,15094,12375,10651,9456,8955,10421,
1994,8099,8107,9221,10092,11341,13070,14899,14783,12242,10512,9043,8564,10850,
1995,8624,9066,9504,10500,11719,12687,14975,15446,12926,11256,10171,10085,11413,
1996,8489,9339,9347,10757,12351,13652,15715,16214,13044,11347,9202,9045,11542,
1997,8577,9286,9660,10783,12401,13408,15023,16065,13183,11738,10764,10108,11750,
1998,8957,10144,10827,11918,12945,13806,15261,16433,13823,12338,11306,10232,12333,
1999,10059,10421,11624,12340,12815,14503,16891,17451,14322,14441,11359,10989,13101,
2000,9140,10932,11308,11943,12299,,14843,17266,13251,12056,10935,10676,,
2001,10309,10708,11388,12127,13608,14742,16672,17623,14344,12763,11615,11041,13078,
2002,10417,11334,11048,12546,13778,15181,17216,18099,14494,13027,12208,11180,13377,
2003,11147,11648,11547,12719,14059,15488,17780,19270,14481,13403,11106,11234,13657,
2004,10412,11782,12531,13663,13835,16078,19097,18673,15441,13956,12622,12381,14206,
2005,10329,12295,12042,13430,14666,16201,19183,19386,15297,13681,12914,12357,14315,
2006,11881,12739,13285,14086,14958,16422,19090,19449,15691,14050,12924,13073,14804,
2007,11973,12834,13671,14328,15492,17095,19762,20460,16017,14435,13319,12246,15136,
2008,11078,12813,12321,13253,14783,15935,18876,,,13003,12418,10803,,
2009,11083,11882,11986,13097,14454,15717,18452,18883,15202,13572,12374,12188,14074,
2010,11566,12489,12981,13494,14420,16013,19705,20303,15850,14315,12111,11944,14599,
2011,11728,11613,12376,12887,14346,15871,19546,20597,16399,14299,,12213,14596,
2012,11696,11863,12445,,,,,,,,,,,
2013,,,,,,,,,14050,13541,11693,11405,,
2014,10988,11274,11643,11911,14755,15641,19335,20345,14651,14341,12383,12046,14109,
2015,11888,12490,13170,14027,15554,17522,20679,20641,16368,15633,13482,12655,15342,
2016,12548,13450,13929,15002,16409,18722,22740,22423,18954,16509,14324,13600,16551,
2017,12782,13260,14267,14980,16755,19054,23099,23427,18518,17917,15004,14242,16942,
2018,13907,14195,15748,16170,18573,20467,22786,23841,19268,18595,15804,15303,17888,
2019,14833,13876,15479,16872,18527,21373,24930,25001,19431,18509,16158,15402,18366,
2020,14219,15534,13550,12092,15419,18776,20054,21977,19610,17641,15463,15547,16657,
2021,15898,16116,17871,19129,20863,23502,26121,24825,21217, ,17421,16969,19994,
2022,15923,16954,17458,18193,19197,20913,23695,23841,20787,19959,16048,16045,19084,
2023, ,16608,17523,18614,20532,22926,24991,24819,21191,20236,17699,17055,19924,
2024,15100,17425,18477,19795, , , , , , , , , ,