Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg., 1990,2820,3202,3714,4167,4201,5569,6209,5235,4377,3894,3518,2738,4142, 1991,2874,3385,3654,3983,4620,5615,6714,5842,4762,4369,3595,3449,4413, 1992,3461,3630,4336,4600,5631,5933,6125,5365,4425,4514,3812,3790,4653, 1993,3442,3641,4362,4721,5869,5884,6531,6032,5267,4859,4131,4027,4906, 1994,3826,3988,4763,5154,5962,6863,7280,6092,5366,5269,4480,4045,5266, 1995,4054,4380,4857,5352,5961,6665,7213,7029,5863,5496,4580,4202,5471, 1996,4122,4577,4939,5712,6257,7184,7631,6824,5781,5625,4935,3882,5622, 1997,3060,3369,3523,3939,4261,4286,4657,4629,3905,3571,3295,3086,3798, 1998,3019,3331,3616,4062,3984,4293,4774,4568,3741,3359,2950,2965,3722, 1999,2959,2958,3319,3797,3947,4227,4616,4261,3684,3131,,,, 2000,,,3813,4036,3769,4412,4645,4462,3891,3823,3869,3434,, 2001,3176,3396,3858,4386,4367,4690,4738,4641,4172,3826,3459,3204,3993, 2002,3109,3316,3487,4154,4284,4639,5053,4487,4015,3835,3677,3514,3964, 2003,3517,3597,3742,4152,4459,4804,5263,4657,4130,3889,3505,3499,4101, 2004,3230,3469,3893,4307,4394,4875,5125,4600,4105,3969,3694,3722,4115, 2005,3509,3788,3916,4275,4443,4660,5071,4736,4146,3974,3667,3575,4147, 2006,3530,3829,3794,4392,4612,4670,5051,4648,4246,4038,3803,3634,4187, 2007,3603,3750,4046,4392,4560,4860,4985,4693,4315,4197,3936,3698,4253, 2008,3496,3783,4118,4787,4766,4968,5121,4990,4460,4226,4134,3699,4379, 2009,3639,3946,3998,5012,5040,4749,6328,5802,4851,3245,2966,2638,4351, 2010,2540,2771,2901,3190,3298,3233,3630,3403,3238,3220,2724,2578,3061, 2011,2577,2681,2742,3177,3349,3346,3489,3714,3430,3271,2763,2720,3105, 2012,2646,2811,2910,3593,3786,3618,3781,3745,3515,3314,2982,2889,3299, 2013,2666,3094,3837,2607,3668,3670,3815,3735,3615,3494,3140,2912,3354, 2014,3025,3252,3633,4940,5090,4021,4089,4462,3924,3672,3214,3282,3884, 2015,3219,4380,7388,8079,8187,7496,5148,5183,5094,6168,4029,3866,5686, 2016,3968,4272,4345,5013,5087,4804,4979,5002,4778,4603,4329,3988,4597, 2017,3412,4113,4537,,4375,4430,4484,5067,4898,4739,4413,4143,4419, 2018,4276,4571,4691,5483,5678,5491,5759,5801,5639,5581,5121,4977,5256, 2019,4977,5033,5402,6053,6097,5940,6294,6479,6197,7081,6608,5635,5983, 2020,5515,5836,5081,4373,5329,5790,6226,6228,5763,5799,5060,4865,5489, 2021,4976,5184,6288,7337,7172,6901,6831,6707,6409,6405,5931,5656,6316, 2022,5313,5956,6172,6739,7200,6811,7189,7215,6914,6756,5914,5775,6496, 2023,5965,6237,6180,7310,7377,6741,7358,7259,6966,6919,6358,6113,6732, 2024,5553,6367, , , , , , , , , , , ,