Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg., 1990,2849,2869,3440,3821,4124,4472,5067,5070,4509,3903,3530,3018,3896, 1991,2881,3388,3522,3996,4375,4641,5213,5216,4590,4368,3786,3562,4133, 1992,3422,3720,4198,4474,5011,5166,5564,5598,4997,4589,3941,3384,4520, 1993,3221,3674,3997,4511,5195,5429,5779,6048,5667,5286,4196,4040,4760, 1994,4016,4073,4674,5212,5667,5921,6326,6300,5979,5469,4521,4320,5214, 1995,4524,4690,4948,5475,6126,,6808,6736,6429,5650,5067,4755,, 1996,4182,4574,4930,5521,5783,6356,6777,6617,5962,5544,4682,4217,5429, 1997,4418,4768,4861,5352,5992,6617,7176,7191,6466,6005,5467,4903,5768, 1998,4613,5096,5597,6027,6426,6659,7212,7049,,5854,5422,4954,, 1999,4869,5186,5613,6107,6458,6709,6783,7339,6799,6466,5849,5441,6135, 2000,4915,5443,5864,6405,7000,7422,7696,7740,6849,6451,5644,5197,6386, 2001,5150,5384,5828,6065,6602,6849,7306,7487,6765,6382,5726,5077,6218, 2002,5101,5367,5448,6170,6680,6766,7174,7464,6828,6585,5922,5611,6260, 2003,5440,5874,5712,6002,6438,7124,8029,7588,7009,6768,5655,5557,6433, 2004,5155,5719,6184,6701,6749,7393,8037,7828,7181,6774,6141,5812,6640, 2005,5386,6080,6286,6523,7036,7484,8093,8156,7246,6900,6300,5762,6771, 2006,5765,6026,6339,6627,7098,7493,7823,8007,7347,6962,6145,5815,6787, 2007,5618,5948,6470,6793,7188,7649,8125,8514,7581,7243,6527,5745,6950, 2008,5163,5742,6051,6520,7189,7335,7968,8018,7430,7082,6105,5340,6662, 2009,5456,5850,5946,6631,7191,7455,8346,7955,7623,6943,6351,5787,6795, 2010,5641,6076,6522,6717,7874,7768,,8079,7710,7085,6147,5817,, 2011,5631,5898,6181,6596,7256,7642,8252,8172,7713,7077,6310,6156,6907, 2012,5819,6117,6334,6927,7447,7650,8466,8552,7704,7318,6456,5983,7064, 2013,5666,6133,6515,6959,7558,7913,8664,8679,7627,7437,6554,6130,7153, 2014,5981,6088,6789,7289,7820,8229,8943,9021,8401,7803,6856,6515,7478, 2015,6187,6534,7175,7902,8565,9143,9813,9473,8685,8219,7442,6894,8003, 2016,6718,7020,7816,8643,9134,9843,10465,10717,9544,9007,8244,7179,8694, 2017,7014,6909,7431,8791,9818,11012,11909,11893,10250,10006,8666,7996,9308, 2018,7874,7415,8387,9476,10671,11625,13081,12817,11215,11042,9447,8839,10157, 2019,8585,8119,8739,10201,11412,12480,13286,13600,11595,11116,9971,9364,10706, 2020,8761,9678,8739,8171,9541,11957,13248,13161,11745,10865,9479,9254,10383, 2021,9640,9776,10181,11881,13002,14322,15505,14595,13069,12627,11030,10005,12136, 2022,9479,10215,10499,11945,12533,13721,15028,15344,13292,12684,10237,9624,12050, 2023,10024,9718,9803,9959,11367,12612,13132,13252,12207,12007,10642,10058,11232, 2024,9124,10446, , , , , , , , , , , ,