Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,2977,3097,3748,4027,4518,5465,5794,5850,4669,4204,3834,3078,4279,
1991,2867,3201,3920,3975,4423,5419,5871,6249,4783,4304,3733,3632,4373,
1992,3183,3412,4135,4272,4691,5672,6087,6227,5076,4714,4043,3486,4600,
1993,2523,3081,4029,4472,4641,5650,6331,6531,5311,4713,4209,4054,4638,
1994,3450,3640,4461,4730,5158,6262,6821,6683,5552,5086,4195,3978,5011,
1995,3579,3920,4593,4740,5231,6343,6811,6850,5811,5126,4980,4319,5192,
1996,3491,3828,4848,5001,5392,6429,7015,7136,5819,5124,4743,4264,5258,
1997,3850,4185,5058,5111,5625,6650,7377,7441,6005,5567,5150,4678,5558,
1998,4133,4353,5154,5445,5864,6992,7641,7690,6230,5776,5395,4770,5787,
1999,4407,4593,5611,5692,6272,7352,7941,7983,6670,6103,5882,5137,6137,
2000,4496,4764,5704,5910,6174,7219,7797,8102,6505,6100,5376,4776,6077,
2001,4411,4828,5869,6017,6394,7365,7880,8169,6929,6180,5753,4969,6230,
2002,4462,4715,6135,6146,,8034,8271,8424,6708,6431,5923,5680,,
2003,4972,5067,6003,6205,6478,,8441,8598,6853,6613,6035,5507,,
2004,4552,4962,6292,6607,6795,7684,8367,8252,7029,6614,6175,5576,6575,
2005,4805,5361,6866,6553,6836,7944,8765,8372,6996,6590,6491,5849,6786,
2006,5252,5615,6631,6907,7146,8244,8252,8333,7497,7071,6798,6102,6987,
2007,5364,5711,6909,6977,6958,8043,8408,8368,7082,6716,6967,5793,6941,
2008,4917,5017,6640,6567,7032,7621,8236,8167,6776,6543,6487,4985,6582,
2009,5114,5437,6486,6577,7214,8029,8878,8514,7291,6798,6464,5647,6871,
2010,5116,5483,6282,6639,,8175,9049,8809,7642,7089,6185,5817,,
2011,5218,5499,6595,6736,7154,8144,8972,8531,7355,6929,6466,5512,6926,
2012,5255,5590,6719,6845,,,,8756,7724,7492,7067,6459,6879,
2013,5481,5848,7269,7359,7929,9314,9921,9532,7933,7794,6974,6624,7665,
2014,5918,6140,7589,7632,8149,9276,10031,9709,8322,8008,7376,7115,7939,
2015,6474,6848,8323,8295,8843,10317,10959,10594,9294,8813,8131,7236,8677,
2016,6743,7303,8854,8749,9417,10841,11476,11050,9761,9283,8697,7610,9149,
2017,6346,7464,9118,9360,9769,11236,12061,11830,10143,9732,9136,8107,9525,
2018,7331,7840,9412,9649,10319,11609,12285,11727,10303,9832,9579,8434,9860,
2019,7638,7190,9958,10111,10714,12039,12805,12049,10792,10549,9221,8909,10165,
2020,8184,8210,8812,6931,9367,11280,12088,12065,11605,11196,9659,8965,9863,
2021,8691,8471,10899,11475,12298,13692,14412,13481,12365,11726,11277,9718,11542,
2022,8682,9551,11121,11387,12202,13549,13547,13033,12129,11426,10650,9168,11370,
2023,8394,8789,10298,10841,12112,13539,14091,13214,12126,11781,11164,9566,11326,
2024,8287,9523,10977, , , , , , , , , , ,