YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,11949,12788,14066,13645,13434,12969,12619,12845,18697,19598,13525,11159,13942
1991,11677,12989,12959,13974,13732,13183,13283,13391,14245,14396,13084,12571,13289
1992,12925,14098,14292,14945,14425,13963,13668,13535,14419,14515,13283,12941,13952
1993,12452,13264,14649,14565,14756,14580,14011,14367,15104,14845,13896,13213,14145
1994,13599,13969,15428,15474,14540,13249,12334,14684,15526,15247,14336,13289,14305
1995,13801,15089,14864,15612,15564,16894,14579,15886,15716,15776,14792,14226,15233
1996,13698,14850,15179,15719,15070,14238,12975,14016,15689,15390,14612,13891,14611
1997,13659,14740,14166,15229,17454,,,,15435,15106,14494,13569
1998,13779,14590,14607,14885,14442,13335,15536,10928,14156,15317,14448,13591,14135
1999,13726,14649,14812,14996,13309,13750,14160
2000,
2001,
2002,,,,,,,,15333,15130,15715,14219,13417
2003,13761,14412,14122,15540,15957,15252,14995,13841,13737,14533,14173,12351,14390
2004,12928,13804,14417,15356,14149,14999,14160,15413,16048,12691,13323,12667,14163
2005,12568,13795,15151,,13191,13571,12800,13662,14505,13521,13047,12095
2006,12487,13447,13540,14263,14283,13972,13469,15176,15059,13866,13141,12279,13749
2007,12789,13613,13878,14500,14363,13510,13140,14092,13900,14409,13370,12246,13651
2008,12623,13465,13247,14621,14190,13311,12983,13073,13944,14120,12869,12344,13399
2009,12516,13159,12965,14648,14311,13657,13198,13488,14118,13971,12983,12308,13444
2010,12341,13367,13563,14356,13728,13547,13021,13460,14179,13930,12688,12452,13386
2011,12676,13153,12974,14035,13588,13243,12662,13419,13738,13693