Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1992,,,,,,,12763,13604,14318,14582,13721,13861,,
1993,12538,14076,15178,16265,16205,16876,16503,16474,16171,16529,16309,15901,15759,
1994,15024,15923,17446,17822,17650,18252,17688,18234,18006,18135,17396,17010,17389,
1995,17242,18329,18843,19280,19364,19884,19407,19533,19048,18902,18223,17774,18819,
1996,17230,18603,19683,20193,20724,22340,22348,22593,21349,21590,19924,17694,20356,
1997,18533,19862,20298,20703,20778,21100,20474,20674,21056,20719,19967,19489,20304,
1998,18880,20526,21397,21648,21506,22042,21451,21387,20988,20677,19469,19667,20803,
1999,19485,20201,21606,22024,21668,22135,21223,21463,20892,20558,19925,19740,20910,
2000,19392,21104,21702,22104,21287,,,18543,19402,19984,19602,19242,,
2001,18554,20074,21086,20978,22658,,,,,,,,,
2002,,,,,,,,,,,,,,
2003,,17694,18140,20492,21606,21886,21324,21193,21201,21443,19957,20493,,
2004,19690,21268,22736,23711,22871,23617,22996,22786,22496,22392,21651,21594,22317,
2005,21185,23989,24005,24449,23853,24819,23930,24920,23897,23635,23245,22722,23721,
2006,22860,25432,26576,27433,27995,28400,26828,27135,26191,25766,24765,23028,26034,
2007,22619,24096,24861,24942,25065,24888,23833,24539,23138,23713,22609,21443,23812,
2008,21211,22510,22879,,22979,23014,22123,21520,21669,21694,19841,20017,,
2009,19699,21392,21557,23133,22834,23482,22439,22092,22121,21261,20353,20216,21715,
2010,19641,21697,21984,22747,21916,21779,21254,21534,21812,21450,20728,20581,21427,
2011,20480,21896,21830,22481,21986,24656,22039,22124,22649,21770,20131,21005,21921,
2012,19682,21488,21525,22441,22715,22242,21099,23052,23684,20450,19692,19892,21497,
2013,19010,21370,21532,22636,22421,22261,21404,22085,22033,22020,21466,20109,21529,
2014,20316,21820,23075,23900,23096,23033,22158,22548,,20820,18884,19496,,
2015,19506,21525,21834,22537,22126,22695,21438,21885,21882,22009,20161,20132,21477,
2016,20666,22087,22465,24710,24642,23624,23176,23135,23630,22808,21309,20260,22709,
2017,20329,21587,23002,23561,22806,23890,21744,22164,21972,21857,20951,20516,22032,
2018,20443,21457,22194,23588,23667,22128,21817,22341,22561,22980,21877,20446,22125,
2019, , , , , , , , , ,22460,21493,21103, ,
2020,21109,22617,21290,16421,20156,22300,21634,22647,22876,23185,21297,21270,21400,
2021,22124,23327,25459,26425,25692,24524,23730,22958,22423,22764,21562,22753,23645,
2022,20770,22581,23056,23791,24061,23708,22752,23613,22869,23260,21159,20619,22687,
2023,21056,22300,22365,23304,23289,22418,21507,22638,21971,22530,21045,20575,22083,
2024,19509,22143,22573, , , , , , , , , , ,