Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg., 1990,955,1154,1277,1472,2671,3745,4533,4184,3095,2089,1310,1100,2307, 1991,892,1300,1270,1223,2215,3716,4707,4637,3385,2477,1163,1162,2354, 1992,1176,1386,1425,1561,2849,3866,4829,4447,3240,2343,1334,1128,2478, 1993,1060,1292,1455,1427,2473,3758,4925,4865,3673,2535,1442,1380,2533, 1994,1421,1470,1741,1816,3077,4676,5268,5204,3742,2592,1507,1456,2841, 1995,,,,,,,,5381,4191,2834,1760,1714,, 1996,1439,1749,1842,1759,2914,4656,5685,5415,4024,2773,1697,1457,2951, 1997,1470,1768,1907,1663,2864,4320,5787,,3620,2644,1649,1502,, 1998,1373,1674,1716,1730,2678,4297,5764,5381,4269,2964,1744,1458,2921, 1999,1533,1572,1917,1725,2767,4730,6232,5754,,3085,2026,1392,, 2000,1403,1751,1844,1877,3202,4686,6038,5884,3996,2853,1704,1593,3069, 2001,1687,1729,1887,1719,2501,,5700,,3847,2877,2136,2011,, 2002,,,2094,1885,3337,4961,5544,5268,4091,2900,1887,1689,, 2003,1699,1791,1843,1914,3370,4938,6087,5619,4043,3215,1849,1568,3161, 2004,1458,1775,2049,2026,3553,4829,6183,5373,4432,3326,2031,1747,3232, 2005,1374,1869,2042,1963,3297,4750,6205,5298,4081,2935,1943,1678,3120, 2006,1406,1838,1933,1966,3256,4890,6247,5288,4444,3111,2013,1769,3180, 2007,1680,1791,2146,2195,3711,5231,6360,5699,4572,3177,2295,1446,3359, 2008,1548,1959,2064,1992,3111,4873,6001,5473,4159,3092,2117,1580,3164, 2009,,2064,1921,1970,3571,4938,6839,6183,4710,2937,1980,1830,, 2010,1818,1884,1981,2131,3385,5324,6912,5822,4679,3298,1637,1323,3350, 2011,1593,1792,1831,1917,2979,5087,6642,5821,4803,3233,1971,1944,3301, 2012,1672,1885,2001,2213,3566,5242,6595,5799,4610,3195,2078,1923,3398, 2013,1613,2061,,2149,3740,5409,6858,6071,4645,3192,2213,1941,, 2014,2007,1832,2189,2426,3997,5516,6862,5935,4730,3587,2276,2187,3629, 2015,2128,2295,2447,2733,4501,6521,7691,6616,5588,3874,2339,2073,4067, 2016,1981,2305,2337,2728,4774,6820,8224,,,,,,,