Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
2001,,,,,,,,,,23417,24844,23753,,
2002,23159,24348,25136,24823,25527,25402,25543,26018,24387,22576,24026,25092,24670,
2003,23145,23981,23889,24876,25684,25632,25274,25416,20692,23949,22697,24406,24137,
2004,22993,23055,24398,24458,23856,25036,24954,24518,23553,23589,23349,24768,24044,
2005,21958,23577,23826,23619,23909,24552,24887,26374,23182,23022,22870,24793,23881,
2006,22044,23305,24252,23855,24676,25040,24344,23920,19593,23449,23686,24694,23572,
2007,22555,24098,25237,25000,25725,25844,25266,26422,24014,24895,24067,23946,24756,
2008,22481,23423,24083,25027,26501,25759,,24708,24415,24917,,,,
2009,23916,24936,24496,26694,25486,24658,24810,25089,24254,23954,23342,25105,24728,
2010,22753,24468,24665,25139,24602,25410,25308,25671,24744,24452,23302,25086,24633,
2011,22966,24288,23766,24377,24563,25886,24602,25122,23869,24018,23045,24397,24242,
2012,22695,23734,23920,24636,25052,24553,24180,25462,24381,24552,23448,23733,24196,
2013,21838,23409,24444,24419,24999,24764,23333,,23646,,22720,23418,,
2014,21911,23299,23632,24404,23906,22685,19070,18822,17967,18059,20551,22157,21372,
2015,20879,22970,22854,23397,23226,23358,22598,23310,23085,23549,22485,22283,22833,
2016,21164,23126,22886,24194,24218,22998,20885,22647,22253,22620,22030,22602,22635,
2017,20859,22286,23178,23567,22472,23436,22976,23478,22756,23030,22283,22485,22734,
2018,20964,22310,22846,24115,24656,20502,23610,24099,23071,22946,22394,22861,22865,
2019,21438,22094,23300,22274,24180,24325,23694,24487,23633,23402,22847,22854,23187,
2020,21363,22846,20078,12912,12097,16788,22652,22750,22055,21783,20754,21731,19820,
2021,20844,21184,23289,23965,24135,24240,23701,23323,20618,20125,19377,20214,22085,
2022,19179,20072, ,21636,23539,23367,23094,23728,24162,23822, , ,22500,
2023, , , , , , , , , , , , , ,
2024, , , , , , , , , , , , , ,