Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg., 1990,248,284,354,424,453,594,679,625,575,483,375,243,445, 1991,243,295,348,379,437,564,709,708,560,521,354,297,452, 1992,258,318,421,410,467,589,746,688,573,583,388,326,483, 1993,211,250,369,467,453,543,713,704,579,594,411,298,467, 1994,288,298,410,497,526,650,845,777,713,638,421,325,534, 1995,309,338,406,470,498,627,815,828,688,677,471,364,541, 1996,306,364,453,496,492,596,806,793,651,629,427,350,530, 1997,354,394,492,495,518,612,816,746,649,630,481,379,547, 1998,336,358,449,505,519,636,855,832,682,593,459,343,547, 1999,348,342,462,495,520,619,851,820,685,591,501,360,550, 2000,320,382,461,474,526,613,829,709,617,583,447,342,525, 2001,299,325,450,502,547,638,816,782,660,610,508,340,540, 2002,288,361,488,593,529,671,802,777,588,547,420,349,534, 2003,302,330,489,536,548,689,839,851,667,617,445,359,556, 2004,301,360,515,555,535,648,823,749,657,599,457,357,546, 2005,293,352,474,559,521,654,871,763,636,565,426,367,540, 2006,325,363,459,560,502,621,800,743,630,584,448,370,534, 2007,339,372,499,550,571,675,792,786,684,633,491,371,564, 2008,324,324,450,,521,638,771,756,616,589,454,339,, 2009,323,356,497,556,543,658,920,791,677,553,430,355,555, 2010,319,372,546,597,506,693,969,879,743,598,427,342,583, 2011,345,349,451,567,503,628,876,847,696,567,420,369,552, 2012,357,370,487,527,517,642,867,804,633,570,425,333,544, 2013,305,335,456,488,517,627,810,783,630,545,432,327,521, 2014,315,322,462,501,517,662,880,764,659,649,419,348,542, 2015,323,379,487,496,564,716,872,834,709,612,420,343,563, 2016,321,370,486,527,570,749,909,896,752,614,488,323,584, 2017,281,348,450,503,575,716,898,1084,710,633,478,372,587, 2018,329,356,449,514,580,759,975,878,761,621,463,364,587, 2019,322,297,429,510,575,763,958,920,757,610,470,380,583, 2020,329,348,365,391,577,775,1082,960,897,703,464,388,607, 2021,348,375,492,600,682,904,1045,979,850,673,536,391,656, 2022,333,392,470,533,616,780,994,1005,811,689,474,363,622, 2023,338,360,399,581,619,792,1011,886,820,680,487,372,612, 2024,313,373, , , , , , , , , , , ,