Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1991,,,,,,,,,,,,12413,,
1992,11682,12696,13687,14285,14027,14774,15042,15295,15069,14422,12943,12179,13881,
1993,10982,12463,13460,14069,14826,15797,16296,16571,16476,15640,14329,13945,14582,
1994,13611,13886,16079,16304,16267,17230,17515,17883,17804,16578,15528,14927,16146,
1995,14204,15562,16457,16762,16808,17761,17676,18194,17765,17561,16365,15461,16715,
1996,13752,16358,17372,17533,17287,18412,18326,18717,,17503,16812,14998,,
1997,14627,16595,17552,18010,17683,18278,18465,19880,19365,18623,18105,17200,17865,
1998,16005,17598,18650,19731,19391,20386,20368,20847,20036,19543,18704,17581,19070,
1999,16331,17332,19216,19421,20044,21015,21464,22108,20428,19596,19092,18176,19519,
2000,16966,18640,19735,19701,20310,21501,21470,23228,22064,21543,18999,18981,20262,
2001,17337,19019,20533,21313,21506,22589,22068,22939,21763,21474,20367,17992,20742,
2002,17675,19602,20624,19609,19339,19272,21432,23810,23044,21859,20915,20324,20625,
2003,19253,20177,20935,22098,22716,23061,22989,23770,23671,22910,20974,19897,21871,
2004,18180,19400,21956,22843,22169,23232,23154,23782,23355,22248,21459,20681,21872,
2005,18803,20900,22003,22839,22036,23262,23736,24738,22981,22082,21266,20512,22097,
2006,19033,20049,19443,22399,22330,22967,22251,22492,21828,22380,21507,20745,21452,
2007,19394,20180,23332,23966,22222,,,23553,23219,22747,22329,19894,,
2008,18909,20294,21741,22699,22473,22718,22831,22623,23091,22437,21115,19430,21697,
2009,19559,,,,,,,,,,,,,
2010,,,,,,,,,,,,,,
2011,,,,22661,22548,23526,23487,24274,23640,23024,21784,21100,22792,
2012,20102,21311,21984,23576,23539,23992,24298,24947,24362,23779,22589,20961,22953,
2013,19149,21348,22438,21987,22553,23059,23273,23674,22718,22010,21487,20443,22012,
2014,19884,21054,22747,23997,24158,24938,25109,25760,25860,25716,23156,22928,23776,
2015,21991,24419,25471,26260,26176,27267,26606,27184,26954,26142,24277,22875,25468,
2016,22306,25157,26355,28267,28489,29774,29417,29655,28876,28014,26680,22902,27158,
2017,21332,24564,27273,28619,29071,29448,28971,29202,28097,27703,26704,24753,27145,
2018,24491,25503,26936,28709,29128,30905,30965,31775,30799,29765,27853,25177,28501,
2019,24917,25179,28209,29833,29659,30954,30405,31347,30893,29123,27731,24308,28546,
2020,22575,24109,21701,17449,22329,25767,26620,26951,26461,25136,22508,21755,23613,
2021,22111,22353,25585,27027,27430,29217,29305,28594,28291,27111,25612,24979,26468,
2022,21788,23842,25650,26406,27510,28933,28125,28825,22444,25550,23410,21853,25361,
2023,22201,23082,24089,25379,21496,24748,25195,24909,25616,25410,17385,23330,23570,
2024,22092,24982,25079, , , , , , , , , , ,