Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
1990,3453,3797,4596,5024,5306,6094,6584,6872,5392,4549,4625,4059,5037,
1991,3643,4380,5039,5048,5313,6392,6903,6962,5737,5160,4850,4901,5367,
1992,4276,4752,5300,5901,5938,6856,7916,7940,5969,5594,5119,4727,5878,
1993,4080,4728,5624,6168,6208,7227,8880,8670,6713,5861,5218,5031,6211,
1994,4872,5103,5996,6439,6791,7567,9079,8539,6977,6017,5239,5687,6537,
1995,5021,5572,6220,6462,6795,7946,9079,9054,7471,6414,6331,6073,6870,
1996,4982,5693,6517,6952,7122,8229,9429,9573,7523,6597,6280,6079,7081,
1997,5375,5985,6977,6728,6830,8480,9827,9845,7681,7043,6855,6546,7348,
1998,5739,6228,6845,7552,8154,9059,11140,10339,8261,7421,7152,6678,7881,
1999,6087,6535,7675,7819,8215,9697,11077,10903,8676,7700,7617,6978,8248,
2000,6232,6928,7665,7919,8391,9498,11045,10623,8281,7753,7305,7037,8223,
2001,6361,6783,7822,8104,7930,9818,10687,,,,,,,
2002,,,,,,,,10947,8737,8128,7508,8271,,
2003,6905,7081,7951,8387,9329,10162,11548,11184,8668,8283,7776,7312,8716,
2004,6614,6817,8247,8966,,9587,11582,11146,9259,8618,8142,7728,,
2005,6469,7197,8408,8515,9165,10251,11717,11317,8871,8834,7959,7587,8858,
2006,6766,7703,8410,8735,9037,10408,11733,10898,9564,8581,8317,8055,9017,
2007,7059,7657,8867,9110,9369,10694,11937,11533,9624,8708,8779,7590,9244,
2008,6893,7409,8739,8582,9101,9588,10813,10528,8994,8627,8343,7618,8770,
2009,7265,7639,8371,9274,9961,10664,12578,11575,9908,9012,8642,7806,9391,
2010,7105,7628,8610,9360,9825,10588,12676,11704,9896,9172,8335,7749,9387,
2011,7172,7454,8495,9176,9393,10349,12023,11017,9849,8850,8322,8472,9214,
2012,7144,7659,9050,9209,9502,10517,12072,11452,9634,9168,9152,7766,9360,
2013,6725,6860,9029,9451,10528,10800,12414,11649,9739,9291,8486,8362,9445,
2014,7425,7923,9157,9760,10120,11406,13101,12135,9892,9440,8909,8600,9822,
2015,7947,8874,9936,10394,10989,12469,14196,12544,11435,10511,9614,9085,10666,
2016,9761,9034,10523,10735,11590,13276,15341,13318,11962,10725,10382,8939,11299,
2017,7786,9098,10688,11306,12233,13571,15420,16619,11658,11296,10564,9938,11681,
2018,9026,9278,11316,11464,12696,14014,15699,14529,12442,12040,10994,9945,11954,
2019,9014,8932,11442,11928,12765,14321,16251,14606,13012,11912,10531,10559,12106,
2020,8940,9593,9296,6201,9765,12611,14836,13896,13452,11673,9791,9558,10801,
2021,9957,9315,11492,12019,13469,15739,17209,15011,14104,12614,12155,10533,12801,
2022,9741,10583,11778,12210,13290,15054,16530,14543,13886,12985,12091,10369,12755,
2023,9964,10151,11534,12218,13659,15665,17822,15605,14314,13460,12186,10962,13128,
2024,9336, , , , , , , , , , , , ,