Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,30899,32618,33025,32939,32932,33636,31995,33310,31034,32133,21650,13727,29972,
1991,13432,14353,14122,14542,14531,14319,13603,14147,13157,13683,9219,26087,14621,
1992,29162,32202,33978,32704,31117,33286,31592,22190,19734,20463,18931,15688,26804,
1993,17325,19741,20925,20670,19756,19558,14741,15434,20667,20646,19772,20222,19105,
1994,19318,20197,21338,20996,20375,21598,18799,19998,19389,19171,18482,18632,19852,
1995,18699,19351,19601,19851,,21153,19279,19827,19368,19597,19049,18978,,
1996,18507,20063,20828,20582,20312,21292,19287,20050,19764,19417,18901,18482,19790,
1997,18350,19437,19896,20281,20248,21131,19397,19826,19710,19511,18812,18915,19626,
1998,18039,19924,20175,20474,20087,21031,19711,19999,19258,19108,18015,18801,19552,
1999,18571,19107,19745,20135,19987,20462,18484,18563,17993,18133,17373,17438,18833,
2000,17359,17879,18160,18279,18031,18848,18080,17853,17724,17779,16864,17284,17845,
2001,16601,17541,17855,17992,17902,18845,17244,17751,16956,17128,16699,16403,17410,
2002,16559,16691,16089,17376,17298,17301,16621,16947,16529,16925,16245,16155,16728,
2003,14489,13907,13476,13937,13569,13990,13153,13029,14224,15050,14006,14787,13968,
2004,14292,15222,15813,15598,15188,15663,15109,15611,15443,15166,14888,15267,15272,
2005,14806,15781,16102,16110,15640,16334,15264,16169,15628,15343,15085,15101,15614,
2006,15084,15976,16215,15883,16026,16300,14880,16090,15600,15609,15244,15073,15665,
2007,15270,15846,16169,15929,15860,15692,15015,16072,15720,15700,14904,14689,15572,
2008,14914,15604,15247,15740,15413,14952,14506,14390,14743,15056,13801,14324,14891,
2009,14327,15508,14971,15401,14804,15379,14593,14029,14836,14634,13897,14230,14717,
2010,14124,15140,15334,15362,14664,15198,14533,14732,15007,14643,14068,14361,14764,
2011,14608,15124,15242,15330,14924,15213,14591,15089,15088,14989,14128,14537,14905,
2012,14294,15407,15338,15605,15576,15478,14626,15195,15032,14526,14198,14269,14962,
2013,13776,15260,15580,15831,15637,15672,14795,15389,15434,15488,14794,14435,15174,
2014,14716,16792,17669,16966,16382,16559,16003,16504,16437,16430,15777,15564,16317,
2015,15661,16708,17119,17647,17274,17652,17343,17338,17320,17239,16940,,,
2016,,,,,,,,15357,14980,15126,14514,14172,,
2017,13297,15080,15348,15741,16477,16635,15902,16284,16137,15964,15414,15359,15637,
2018,15196,16112,16545,18322,18366,18988,18053,18318,17748,17924,16809,16348,17394,
2019,16458,16773,17536,18131,17778,18477,17524,17578,16990,16616,15903,15580,17112,
2020,15717,16661,13230,9509,12278,13939,13951,13851,13610,13809,12410,12437,13450,
2021,12477,13137,14104,14550,14931,16033,15387,15348,14764,13950,12975,12802,14205,
2022,12628,13608,14096,14524,14646,14958,14683,15250,14978,14355,13637,13560,14244,
2023,13702,14424,14470,15883,15478,15307,15237,15668,15490,15371,14147,14246,14952,
2024,12911, , , , , , , , , , , , ,