Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,5470,5263,5435,6395,6696,7279,7934,7988,6559,5820,5329,4580,6235,
1991,4514,4890,4852,5560,6462,6747,7936,8302,6802,5974,5277,5186,6051,
1992,4907,5124,5622,6280,7022,7478,8744,8618,7390,6715,6055,5117,6613,
1993,4821,5365,5531,5931,7075,7540,8180,8510,7637,6602,6133,5888,6609,
1994,5609,5728,6042,6620,7547,7908,9269,9367,7981,6789,5861,5904,7062,
1995,5777,5953,6292,6694,7513,7707,8697,8624,7629,6794,6329,6118,7011,
1996,5502,5776,6082,6627,7410,,,9324,7731,7182,5947,5448,,
1997,5544,5833,5900,7101,8313,8689,9545,9644,8161,7325,6716,6239,7418,
1998,5716,6148,6489,7204,7999,8443,9721,9535,8198,7386,6699,6603,7512,
1999,5859,6106,6482,7150,8089,8687,9784,9788,8551,7492,6784,6514,7607,
2000,5789,6458,6444,7104,8074,8605,8904,8581,7110,7061,6326,5957,7201,
2001,5835,6057,6167,6517,7688,7991,9022,8915,7812,6989,6518,6058,7131,
2002,5969,6248,5959,6701,7870,8436,9669,9672,8274,7520,6709,6417,7454,
2003,6273,6539,6191,6891,8263,8695,9904,9424,8116,7542,6436,6449,7560,
2004,6081,6551,6770,7453,7869,8522,10032,9556,8436,7624,6946,6853,7724,
2005,6169,6822,6906,7329,8334,8641,9969,9714,8256,7288,6884,6615,7744,
2006,6201,6745,6892,7063,8286,8630,9722,9583,8418,7663,6788,6636,7719,
2007,6430,6664,6907,7352,8365,8793,10062,9962,8398,7528,6941,6277,7807,
2008,5952,6311,6083,6383,7515,7673,9082,9079,7744,6998,6156,5276,7021,
2009,5570,5856,5670,6312,7545,7907,9295,8700,7616,6632,5836,5649,6882,
2010,5424,5625,5958,6304,7210,7625,9058,8705,7440,6563,5671,5592,6765,
2011,5381,5499,5554,5943,,7254,8624,8665,7521,6497,5689,5563,6557,
2012,5275,5472,5374,5986,6917,6952,8626,8584,7220,6222,5503,5231,6447,
2013,5171,5477,5497,5856,6978,7067,8610,8532,7062,6436,5680,5402,6481,
2014,5251,5488,5731,6141,7305,7531,9095,8927,7593,6703,6110,5713,6799,
2015,5607,5876,6125,6610,7636,8143,9171,8559,7679,6978,6278,5892,7046,
2016,5825,6107,6242,6984,7753,8316,9504,9318,8102,6922,6523,6197,7316,
2017,5913,6106,6232,6744,8004,8374,9638,9299,8012,7436,6567,6346,7389,
2018,5941,6290,6593,6971,8287,8515,9910,9538,8283,7727,6813,6550,7618,
2019,6398,6266,6719,7191,8386,8876,10118,9770,8430,7634,6978,6682,7787,
2020,6476,6851,6271,6154,8264,9105,10665,10343,9122,8222,7061,6978,7959,
2021,7114,7088,7632,8078,9022,9928,10872,9821,9174,8378,7655,7313,8506,
2022,6538,7148,7273,7671,8743,9217,10471,10417,9562,8805,7305, ,8392,
2023, ,7050,7435,7949,9270,10058,11128,10352,9402,8489,7196,6520,8563,
2024, , ,7724, , , , , , , , , , ,