Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,4981,5271,5379,5504,5610,5559,5453,5296,4940,5134,5172,4946,5270,
1991,4664,5139,5231,5431,5646,5521,5363,5391,5587,5638,5184,5291,5341,
1992,5071,5475,5542,5720,5838,5733,5455,5497,6658,5619,5271,5382,5618,
1993,4729,5041,5424,5684,5929,6018,5701,5673,5792,5921,5711,5610,5605,
1994,5500,5615,5657,6899,6416,6108,6557,5924,6022,5994,5863,5785,6030,
1995,5654,5905,5929,6061,6272,6311,5919,6222,6148,6196,5928,6051,6050,
1996,5546,5912,6133,6218,6200,6193,5789,5843,6030,6022,5921,5678,5957,
1997,5740,6012,5823,6430,6130,5845,5850,5930,6084,5976,5798,5765,5949,
1998,5486,5800,5883,5999,6031,5934,5771,5764,5741,5845,5640,5645,5795,
1999,5455,5655,5879,5926,6128,6114,5744,5745,5940,6055,5856,5850,5862,
2000,5533,5888,5973,6141,6185,6018,5607,5818,5934,5990,5373,5194,5805,
2001,4928,5234,5417,5686,5819,5441,5052,5142,5258,5286,5201,4952,5285,
2002,4956,5021,5197,5406,5639,5196,5108,5356,5154,5189,5024,5040,5191,
2003,4900,5030,4935,5384,5443,5239,5053,5240,5713,6161,4743,4915,5230,
2004,4496,4642,5143,5526,5550,5478,5144,5189,5267,5410,5267,5502,5218,
2005,4688,5325,5429,5528,5565,5558,5137,5401,5380,5318,5225,5285,5320,
2006,5026,5379,5443,5651,5727,5481,5117,5476,5519,5493,5296,5299,5409,
2007,4993,5334,5400,5508,5663,5404,5172,5351,5182,5454,5174,5072,5309,
2008,4904,5155,4976,5343,5394,5627,5677,5648,5905,5532,5124,5232,5376,
2009,4906,5212,5119,5650,5813,5617,5325,5282,5319,5452,5097,5230,5335,
2010,4922,5317,5369,5625,5521,5467,5336,5367,5463,5464,4926,5172,5329,
2011,4785,5099,5046,5269,5357,5255,5058,5168,5179,5328,4843,5081,5122,
2012,4907,5115,5167,5373,5341,5201,5011,5161,5118,5104,4700,4959,5097,
2013,4506,4872,4988,5209,5283,5097,4945,5130,5259,5330,5016,4879,5043,
2014,4716,5032,5004,5369,5324,5084,5107,5365,5582,5483,4854,5014,5161,
2015,4790,5170,5059,5253,5184,5094,4841,5020,5096,5248,4826,4924,5042,
2016,4708,5010,5014,5344,5637,5275,5058,5092,5044,5127,4857,4668,5070,
2017,4230,4670,4896,5140,5256,4849,4476,4641,4840,4990,4777,4697,4789,
2018,4574,4798,4711,5129,5184,5016,4791,5037,5067,5144,4952,4663,4922,
2019,4577,4752,4965,5256,5239,5109,4847,5065,5253,5247,5001,4915,5019,
2020,4723,5012,4347,3487,4498,4841,4790,5010,5062,4980,4571,4593,4660,
2021,4609,4677,5193, ,5394,5119,4922,4950,5057,5128,4827,4724,4964,
2022,4369,4750,4775,5073,5073,4800,4617,4846,5024,5167,4492,4497,4790,
2023,4640,4757,4635,5148, , , , , ,5214, ,4301, ,
2024,4342,4762,4625, , , , , , , , , , ,