Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,13694,14313,15202,15722,16182,16629,15352,15884,15359,15447,14732,13185,15144,
1991,13466,15091,16600,18484,17948,17164,16340,16294,15841,15549,14482,14818,16009,
1992,15129,15197,15708,16512,17163,16676,15966,15680,15714,15496,14411,14699,15740,
1993,12797,14386,15052,16049,16428,16504,15234,15433,15703,15613,15257,14919,15282,
1994,14213,15049,16248,17100,17421,17337,16143,16440,16236,16147,15779,14064,16016,
1995,,,,,,,,,,,14938,15373,,
1996,14476,15304,15994,16713,16803,16738,15903,16529,15831,15451,15572,15114,15869,
1997,14301,15668,16043,16648,17027,16735,16044,15975,15856,15487,14811,14753,15779,
1998,14001,15199,16189,16390,16680,16610,16244,16243,16229,16003,15392,15185,15864,
1999,14661,15162,16297,16794,17066,17169,16457,16153,16211,16305,15538,15405,16102,
2000,15157,15974,16766,17658,17447,17100,16331,16497,16406,16215,15458,15212,16352,
2001,14157,15697,16238,17046,17488,16798,16433,16763,,16511,15502,14970,,
2002,14918,16010,16339,17410,17702,17414,,,,17209,16399,15995,,
2003,15927,17504,16939,17765,14887,15616,16197,16307,16443,16586,15421,15543,16261,
2004,14103,15995,16824,17474,17346,17230,16801,16785,16770,16521,15603,15949,16450,
2005,13967,16586,17095,17448,17661,16490,17258,17698,16796,16832,16533,16115,16707,
2006,15882,16608,17677,18423,18960,19133,18068,18343,18211,17809,17287,16466,17739,
2007,16239,17125,18133,18625,19324,18019,16852,17559,16804,17583,16125,15562,17329,
2008,14453,16403,16716,17604,17457,16347,15596,15456,15834,16042,15796,15836,16128,
2009,15662,17077,16864,17837,17042,16306,16054,16119,16160,15960,15239,14932,16271,
2010,14655,15943,16317,16436,16158,15906,15973,15970,16310,15918,15283,14676,15795,
2011,14965,15906,15880,16168,16486,16140,15802,15779,15954,15827,15110,,15814,
2012,,,,16443,16416,15810,15668,17381,16241,15677,15164,14921,15969,
2013,13844,15739,16163,16744,16998,16570,16469,16048,16103,16053,15271,14434,15870,
2014,14301,15366,15984,16755,16825,16049,15811,16062,16100,15997,14666,15462,15781,
2015,14858,16520,16574,17348,17081,16525,15966,16664,16716,16711,15938,15477,16365,
2016,15278,16224,16354,17250,17161,16738,16182,16832,17050,17025,16208,14823,16427,
2017,13502,16373,17203,18419,20028,18631,17199,17831,17651,18242,17850,17172,17508,
2018,16118,17042,17528,18243,18313,18062,17227,17907,18195,17973,17316,17594,17626,
2019,16614,17174,18104,12537,6831,6507,6376, , ,6824,6689,8597,10440,
2020,13527,15046,14012,12138,14638,15856,15442,16246,16679,17059,15891,16167,15225,
2021,15788,16204,17365,18242,18126,18223,17620,18816,18837,19360,19141,18389,18009,
2022,17188,18643,19174,20098,19928,20620,21493,21799,21640,21298,19832,18838,20046,
2023,18180,19320,19321, , , , , ,20514,19947,19534,19649,19495,
2024,17201,19624,19824, , , , , , , , , , ,