YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,23914,25259,26618,26206,26484,27638,27299,27385,26837,22546,23838,23123,25592
1991,20204,23896,23889,25017,24616,24770,25377,24645,23660,23881,22055,22595,23714
1992,21868,23048,23948,25788,25160,30591,24432,22302,22001,21768,20278,20407,23519
1993,19205,18587,18686,19487,19947,20646,22512,22490,22052,21000,20627,21065,20539
1994,20415,21200,21924,22256,21966,21970,19094,21830,22903,22408,21355,22405,21642
1995,,,,24877,24609,26055,25180,25483,24640,23848,23515,23426
1996,22889,23946,24513,25393,25275,26290,24509,25388,24844,24462,24442,23568,24627
1997,23110,24629,24718,25974,25949,25959,24774,24940,24234,24076,23424,23222,24584
1998,22405,24007,24573,25908,25663,26933,25241,25490,25718,25549,22678,24152,24860
1999,23340,24167,24896,25828,25909,26770,25155,25501,25419,24889,23748,23562,24932
2000,23318,24686,25218,25833,25140,26191,24527,24643,24753,24359,23361,24048,24673
2001,23242,24702,25343,26167,26125,26331,25044,26108,25252,24409,22178,21673,24715
2002,21965,22860,22864,24979,25112,24781,24730,24573,23979,24132,22827,22568,23781
2003,22814,23519,23175,24506,24360,25273,24019,23963,24432,24183,22054,22843,23762
2004,21899,23041,24155,24785,23936,24761,23767,23745,24186,23695,23021,23180,23681
2005,22430,23552,24247,24788,24134,23871,22710,23787,23122,22713,22425,22982,23397
2006,22536,23527,23733,24044,24249,24281,,24367,24237,23755,23122,22597
2007,22693,23492,24246,24652,24811,24854,23781,24786,23699,24017,23115,21967,23843
2008,21833,23333,22894,24355,24203,23473,22872,22492,23145,22790,21143,21636,22847
2009,21140,22363,22175,23622,22129,21562,21575,22201,22491