Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg., 1990,11949,12788,14066,13645,13434,12969,12619,12845,18697,19598,13525,11159,13942, 1991,11677,12989,12959,13974,13732,13183,13283,13391,14245,14396,13084,12571,13289, 1992,12925,14098,14292,14945,14425,13963,13668,13535,14419,14515,13283,12941,13952, 1993,12452,13264,14649,14565,14756,14580,14011,14367,15104,14845,13896,13213,14145, 1994,13599,13969,15428,15474,14540,13249,12334,14684,15526,15247,14336,13289,14305, 1995,13801,15089,14864,15612,15564,16894,14579,15886,15716,15776,14792,14226,15233, 1996,13698,14850,15179,15719,15070,14238,12975,14016,15689,15390,14612,13891,14611, 1997,13659,14740,14166,15229,17454,,,,15435,15106,14494,13569,, 1998,13779,14590,14607,14885,14442,13335,15536,10928,14156,15317,14448,13591,14135, 1999,13726,14649,14812,14996,13309,13750,14160,,,,,,, 2000,,,,,,,,,,,,,, 2001,,,,,,,,,,,,,, 2002,,,,,,,,15333,15130,15715,14219,13417,, 2003,13761,14412,14122,15540,15957,15252,14995,13841,13737,14533,14173,12351,14390, 2004,12928,13804,14417,15356,14149,14999,14160,15413,16048,12691,13323,12667,14163, 2005,12568,13795,15151,,13191,13571,12800,13662,14505,13521,13047,12095,, 2006,12487,13447,13540,14263,14283,13972,13469,15176,15059,13866,13141,12279,13749, 2007,12789,13613,13878,14500,14363,13510,13140,14092,13900,14409,13370,12246,13651, 2008,12623,13465,13247,14621,14190,13311,12983,13073,13944,14120,12869,12344,13399, 2009,12516,13159,12965,14648,14311,13657,13198,13488,14118,13971,12983,12308,13444, 2010,12341,13367,13563,14356,13728,13547,13021,13460,14179,13930,12688,12452,13386, 2011,12676,13153,12974,14035,13588,13242,12662,13419,13738,13693,12391,11839,13117, 2012,12262,12811,12651,13933,13159,12900,12409,12650,13437,13922,12472,11818,12869, 2013,11568,12566,12673,13594,13340,12920,12422,13278,13736,13900,12547,11644,12849, 2014,11827,12606,12644,13689,13463,12725,12303,12732,13670,13524,12300,11934,12785, 2015,11981,13322,13394,14422,13672,13965,13261,13295,13590,13556,12375,11877,13226, 2016,11002,11757,11700,12789,12146,11658,11298,11724,12160,,10873,10170,, 2017,9980,11111,11401,12065,11862,11379,10745,11280,11552,11858,10850,10054,11178, 2018,10429,10919,10762,11958,11521,10910,11549,15395,13168,11847,10970,10092,11627, 2019,10185,10576,10783,11727,11293, , , , , ,9507,9744,10545, 2020,9924,10592,9486,8105,9564,9975,10146,10483,10653,10247,9091,8705,9748, 2021,9230,9645,10162,10904,11194,10045,9815,10155,10459,10478,9745,9119,10079, 2022,9016,9668,9876,10484,10619,10166,9974,10472,10681,10716,9450,9015,10010, 2023,9330,9757,9578,10381,10703,10142,9877,10318,10603,9803,9657,9038,9932, 2024,9104,11634, , , , , , , , , , , ,