YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,14686,16758,17102,17620,17393,17572,16687,17061,18037,19218,18834,14850,17145
1991,15306,16962,17076,17993,17919,17585,17408,17655,17791,18242,16774,16595,17275
1992,16612,17791,18054,18673,17924,17968,17830,17840,19039,18886,17183,17512,17990
1993,16200,17197,18948,18767,18342,18997,18140,18262,18410,18364,17530,17162,18029
1994,16931,17585,19309,20327,18940,19272,18353,18366,18363,18364,17692,17091,18383
1995,17136,18324,18553,18954,18943,19774,18028
1996,,,,,,,,,,18520,17134,16742
1997,16777,18097,18225,19204,19378,18972,18129,18423,18433,18500,17682,16787,18217
1998,16724,17821,18025,18659,18591,18775,17506,17588,18359,18618,17673,16966,17942
1999,16802,17735,18495,18623,18853,18819,18127,18197,18371,18765,17774,17388,18162
2000,17236,18087,18553,19041,18799,18917,17872,18378,18152,18383,17360
2001,16966,17827,18445,18649,18651,17993,17021,17188,18005,18015,17289,15869,17660
2002,16070,,, ,,,,16603,15651,15828,16772,16289
2003,16662,16944,16484,17972,18037,17383,17171,17494,19950,18123,15898,16960,17423
2004,16035,15929,16170,16733,15974,16706,17552,18058,18815,18102,16935,16356,16947
2005,15495,16847,17593,18552,18272,18487,17092,18285,18711,17953,18161,18773,17852
2006,16606,16744,,16306,16610,16808,15599,18979,19197,18163,17117,16036
2007,15441,16690,17500,18306,18809,17888,16554,18309,17664,17919,16474,15014,17214
2008,15097,16219,,17361,17589,16838,16586,,17347,17365,15622,17612
2009,15019,16065,16496,18124,18096,17915,17151,16856,17050,16982,15926,15641,16777
2010,15217,16402,16775,17609,16395,17074,16129,16657,16977,16831,17050
2011,15729,16055,15973,17006,16627,16729,16382,15662,16124,16150