Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,7297,7880,8250,7594,8635,10146,11445,11403,9780,9186,7866,7582,8931,
1991,7506,7754,7698,7435,8271,9434,11071,11161,9323,9027,7419,7877,8675,
1992,7645,8025,8374,8011,8666,9733,11388,11502,8983,8290,7324,7637,8830,
1993,6589,6918,7553,7164,7299,8407,9195,8818,7990,7613,6699,6967,7607,
1994,7992,8392,8665,7662,7806,8991,11244,11365,10449,9729,7848,8162,9034,
1995,9149,9752,9706,9439,10283,12044,13752,12983,12165,11405,10057,10195,10911,
1996,9516,10276,10548,9920,10695,12567,14041,14094,12417,11736,9942,10008,11313,
1997,9874,10667,10669,10122,10804,12553,14485,14473,12494,11908,10328,10877,11605,
1998,10090,10606,10858,10471,11239,13071,14957,14723,13412,11671,10543,11085,11894,
1999,10539,10554,11261,10578,11479,13395,15467,15119,13876,12910,11253,11595,12336,
2000,10726,11395,11769,11190,12109,14187,15753,15371,13678,13072,11122,11869,12687,
2001,10999,11776,12245,11319,12343,14140,15880,15484,13450,12964,11476,11000,12756,
2002,11458,11989,11794,12372,12663,14249,16067,15328,13228,13473,11448,12025,13008,
2003,11973,12169,11887,12170,12857,14644,16545,16157,14203,14014,11582,12655,13405,
2004,11608,12317,12657,12595,13147,15367,16732,16137,14708,,11501,12711,,
2005,11271,12269,12738,12260,13182,14993,16317,15842,14588,13389,12118,12521,13457,
2006,11158,11694,12164,11828,13050,14755,15628,15493,13966,13412,11507,12435,13091,
2007,11895,12192,12250,11979,12975,14543,16084,15692,13509,13667,11994,12319,13258,
2008,10818,11876,11793,11636,12260,13750,15296,14898,13218,12765,10705,11152,12514,
2009,10759,11195,10505,10723,11172,12957,14811,13672,12856,,10291,11466,,
2010,10224,10770,10539,10330,10487,12535,14571,14124,12497,11473,9877,11736,11597,
2011,10456,10539,9974,9844,10128,12119,14347,13699,12091,,,9883,11308,
2012,9684,10537,10023,9944,10371,12379,14424,13162,11984,11474,10005,11177,11264,
2013,10411,10836,10556,10318,10873,12829,14561,13385,12334,11771,10055,11227,11596,
2014,10514,10730,10490,10454,11017,12947,14887,14132,12538,12161,10378,11730,11831,
2015,11157,11663,11290,11248,11806,13987,15198,14787,13389,12838,10864,12011,12520,
2016,11682,12162,11581,11666,12302,14560,16017,15369,13852,13086,11461,12407,13012,
2017,11691,12326,11775,11563,12468,14612,16176,15863,13806,13390,11582,12917,13181,
2018,12031,12358,11865,11891,12718,15179,16785,15849,14488,13776,12004,12969,13493,
2019,12310,12509,12422,12120,12767,15289,17009,16528,14495,13760,11992,13343,13712,
2020,12410,13022,9596,6962,11161,14233,15894,15557,14984,14146,11644,12833,12704,
2021,12467,13314,13340,13026,14027,16860,18092,16299,15076,14229,12235,13650,14385,
2022,13181,13856,13181,12237,12443,15637,17138,16389,15013,14434,12031,13432,14081,
2023,13607,13890,13114,12710,13438,15791,17026,16479,15051,14415,12485,13612,14302,
2024,12904,13935,13465, , , , , , , , , , ,