Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
2006,,,,,,,20242,19595,18878,16863,17779,17992,,
2007,16646,18206,20419,20588,20602,21849,22635,22320,21112,19339,20188,17422,20111,
2008,16862,17154,19410,20470,20653,21358,22963,22456,21589,20248,19118,16896,19931,
2009,17011,17560,,,21735,22933,25222,23697,23864,20191,,18578,,
2010,17201,,21143,21809,21424,23594,26346,24376,23769,21842,18375,18383,,
2011,17494,18600,19848,21511,21301,23079,25016,24222,23300,21346,19800,19136,21221,
2012,17844,18669,20099,21693,21588,23333,25372,24488,23498,21450,20113,19087,21436,
2013,17022,18752,21038,22272,22409,24480,25954,25813,24381,22435,20824,19655,22086,
2014,18505,19436,21510,23336,23068,25334,27267,26086,24840,23476,21636,21405,22992,
2015,20689,22213,23616,24854,24937,27572,29117,27578,27062,25012,22794,21376,24735,
2016,20282,22335,24650,25681,26168,28897,30567,,32037,26538,24764,21266,,
2017,20294,22507,25560,27254,27698,29268,31072,30949,29171,27033,25260,23526,26633,
2018,22700,23878,25863,28060,28724,31239,32929,31715,31076,28319,26338,23369,27851,
2019,22536,23696,26804,28646,28823,31474,33031,32249,31113,28398,25876,24953,28118,
2020,22477,24614,23301,18025,23643,29080,31196,30275,29856,27369,23717,22919,25539,
2021,22858,22900,26208,27928,29937,34451,35996,33492,33657,30465,28160,24908,29247,
2022,23615,25928,27083,28326,29473,31614,32644,31556,32745,30434,26462,24363,28687,
2023,24181,25119,26603,29686,31518,34457,36132,33862,33904,31323,28531,26373,30141,
2024,23701,26595,27892, , , , , , , , , , ,