Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg., 1990,2556,2718,3142,3516,3564,3926,4162,4235,3798,3650,3154,2559,3419, 1991,2554,2830,3411,3421,3685,3967,4300,4617,3852,3756,3140,2992,3549, 1992,2856,3070,3670,3701,3643,3932,4588,4468,3992,3893,3346,2914,3685, 1993,2634,2858,3451,3974,3870,4190,4788,4803,4336,4129,3469,3182,3813, 1994,3040,3181,3795,4025,3971,4321,4798,4345,4087,3965,3460,3036,3839, 1995,3030,3252,3698,4019,4023,4348,4967,5023,4491,4303,3695,3312,4013, 1996,2842,2980,3769,4033,4008,4506,5004,4946,4316,4410,3785,3382,3998, 1997,3244,3509,4118,4105,4075,5157,5233,5271,4542,4566,4026,3689,4295, 1998,3329,3565,4042,4541,4500,4954,5398,5545,4639,4592,4101,3559,4397, 1999,3378,3653,4265,4508,4595,4937,5533,5484,4858,4724,4341,3837,4509, 2000,3557,3811,4328,4480,,,5591,5581,4758,4712,4295,3781,, 2001,3568,3737,4341,4424,4485,5016,5596,5595,4850,4849,4529,3870,4572, 2002,3575,3905,4402,4622,4729,5306,5784,5899,5053,5097,4460,4203,4753, 2003,3864,3981,4446,4754,4962,5479,6038,6088,5248,5273,4621,4239,4916, 2004,3708,3934,4617,5071,4905,5386,6030,5803,5252,5106,4572,4120,4875, 2005,3587,4008,4703,4677,4785,5390,6058,5822,4967,4685,4463,4091,4770, 2006,3853,4066,4665,4909,4881,5355,5798,5646,5044,4983,4578,4235,4834, 2007,3880,4074,4794,4939,4936,5383,5860,5950,5203,5147,4785,4121,4923, 2008,3696,3944,4697,4863,4927,5069,5523,5519,4866,4915,4533,3788,4695, 2009,3654,3940,4497,5061,4988,5301,5934,5721,5327,5238,4772,4203,4886, 2010,3852,4174,4877,5242,4969,5359,6026,5705,5413,5114,4608,4138,4956, 2011,3820,3951,4555,5186,4894,5373,5466,5535,5130,5196,4667,4072,4820, 2012,3909,3973,4654,5110,4768,5508,5843,5704,,5005,4534,4038,4834, 2013,3732,3990,4536,5165,4939,5300,5733,,5050,5147,4629,4182,, 2014,3883,3944,4802,5134,4998,5328,6036,5601,5180,5524,4880,4180,4958, 2015,4054,4101,5175,5491,5375,5690,6223,6006,5469,5582,5071,4528,5230, 2016,4102,4367,5231,5619,5472,5847,6631,6268,5783,5752,5279,4256,5384, 2017,4188,4246,5299,5763,5634,6084,6711,6878,5579,5714,5221,4401,5476, 2018,4105,4326,5213,5693,5738,6172,6692,6489,5922,5989,5359,4546,5520, 2019,4230,4327,5299,5637,5646,6336,6958,6631,6073,5900,5238,4741,5586, 2020,3953,4465,5188,4022,4990,5957,6618, , , , , ,5028, 2021, , , , , , , , , ,6124,6143,5204, , 2022,4788,4886,5660,6208,6406,7092,7406,7079,6756,6508,5733,4923,6120, 2023,4795,4827,5531,6316,6485,7075,7549,7164,6783,6559,5559,5120,6147, 2024,4603,4997, , , , , , , , , , , ,