Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1997,1773,2324,2423,2650,3340,3751,4684,4250,3569,3344,2837,2523,3122,
1998,2365,2526,2721,3145,3478,4379,5006,4770,3936,3685,2954,2703,3472,
1999,2684,2611,3045,3584,3952,4744,5473,4840,4442,4215,3434,3114,3845,
2000,2954,3262,3621,4319,4704,5695,6095,5517,4683,4510,3376,3538,4356,
2001,3413,3567,4009,4588,5294,5810,6264,5760,4970,4797,4135,3576,4682,
2002,3514,3650,3764,4584,5353,6030,6414,5635,4858,4722,3957,3586,4672,
2003,3642,3631,3792,4159,4972,5846,6401,5510,4705,4658,3759,3532,4551,
2004,3309,3462,3869,4433,4726,5492,6109,5485,4618,4414,3692,3443,4421,
2005,3385,3614,3768,4201,4827,5428,6419,5619,4496,4311,3689,3302,4422,
2006,3394,3641,3604,4284,5034,5847,6589,5653,4934,4668,3853,3534,4586,
2007,3496,3619,4028,4478,5093,5997,6459,5572,4852,4553,3882,3437,4622,
2008,3235,3394,3771,4229,5057,5359,5979,5622,4498,4396,3719,3107,4364,
2009,3221,3432,3501,4255,5287,5403,6609,5950,4951,4271,3692,3123,4475,
2010,3178,3412,3691,4046,4419,5443,6345,5542,4618,4271,3329,3012,4276,
2011,3160,3182,3229,3769,4445,5425,6098,5678,4796,4223,3440,3226,4223,
2012,3136,3303,3378,4374,4893,5594,5996,5364,4722,4331,3633,3271,4333,
2013,2945,3391,3864,4673,5264,5997,6350,5460,4854,4724,3938,3372,4569,
2014,3622,3712,4285,4791,5417,6005,6650,5846,5183,4926,3761,3622,4818,
2015,3788,4387,4757,5234,5969,7024,6801,6245,5680,5350,4440,3917,5299,
2016,4208,4613,4863,6091,6663,7638,7571,6926,6048,5671,5003,3992,5774,
2017,3609,4532,4781,7565,8073,7866,8765,7955,6932,6635,5531,4910,6429,
2018,4950,5103,5300,6362,7532,8232,8931,7902,7061,6727,5707,5044,6571,
2019,5009,4700,5660,6485,7149,8548,9187,8488,7358,5948,5144,5039,6560,
2020,4656,5213,5153,6051,7865,8165,9835,8919,7442,7323,5558,5119,6775,
2021,5247,4983,5885,6598,7414,9369,9471,7865,7214,6885,5987, ,6824,
2022,4954,5504,5917,6417,7276,7907, ,8229,7280,6870,5255,4593,6382,
2023,4959,5090,5004,6421,8197, ,9374,8452,7701,7224,5866,5023,6774,
2024,4471,5193,5160, , , , , , , , , , ,