Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
2004,,,,,21871,23850,25042,24525,22748,21423,19968,19899,,
2005,16081,19016,19986,20964,22078,23794,25387,27558,25254,21053,20274,17066,21543,
2006,17714,18838,19852,20965,23023,24081,24656,24697,22673,21594,19563,18985,21387,
2007,16934,18719,20315,20783,22535,26360,24468,24798,22272,21328,19740,16813,21255,
2008,,15606,17667,19066,21189,21916,23361,23204,21453,20608,18672,17931,,
2009,15777,17430,17933,19775,20708,21509,22813,,20052,19087,17919,17388,,
2010,16871,18127,19056,19887,20750,21291,21766,21585,19946,18593,16317,16087,19190,
2011,14337,15618,16941,17885,19101,20195,20523,21236,19528,18419,16335,16527,18054,
2012,15559,15797,16933,18183,19408,19817,20560,14763,13323,12537,11593,10937,15784,
2013,10041,11398,11910,,15652,16085,17134,18038,16201,15443,14184,14349,,
2014,13710,14446,14866,15239,16038,16471,17948,17758,15821,14862,13770,14046,15415,
2015,14022,14530,14766,15449,16456,17155,17788,17423,16261,15713,14339,14702,15717,
2016,14345,15173,15306,16023,16892,17888,18617,18808,17397,16119,15303,15436,16442,
2017,14650,15328,15935,16279,18037,21035,22591,22799,21469,20951,18234,15865,18598,
2018,15875,16208,16956,17168,19106,19315,19944,19491,18246,17539,16173,16291,17693,
2019,15723,15798,16778,17336,18734,19422,19947,19938,18697,17864,16238,16114,17716,
2020,15563,16325,14690,12898,16402,18303,19521,19863,19352,18403,16357,16468,17012,
2021,16402,16572,17983,18327,19329,20335,20869,19736,18942,18332,16722,16617,18347,
2022,16221,17470,17716,17803,18975,19806,21301,21285,20048,18796,16221,16045,18474,
2023,16988,16798,17138,17525,19277,20386,24128,21632,16600,16626,16963,16983,18420,
2024,15650,16842,17693, , , , , , , , , , ,