YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,16645,17708,18683,18347,18599,17526,17464,16655,16775,18141,19400,19206,17930
1991,18573,19643,19028,20622,20636,21121,20276,20441,20278,20679,19442,20072,20068
1992,20466,21694,21169,21677,20571,20391,20492,18773,18132,17410,15762,16217,19441
1993,15008,16097,16936,17801,17003,17264,16583,16542,16262,15121,13682,14090,16029
1994,13033,13943,14670,15419,14728,15559,15716,15775,15450,15325,14521,14530,14893
1995,14702,15469,15678,16386,16100,15043,13947,15253,15029,14553,13294,13108,14880
1996,12958,12694,,16885,15862,17476,15428,15581,15689,15409,14411,13950
1997,13968,14577,15051,15427,15276,15917,14545,15140,15204,15035,14124,14084,14862
1998,13775,14701,14984,15596,15116,16012,14754,15335,16126,16334,15069,13953,15146
1999,14081,14461,15176,15757,16252,16987,15211,15568,15212,15173,14087,14031,15166
2000,15020,15811,16012,16195,15701,16757,15087,15793,15532,15400,14630,14533,15539
2001,14139,14851,15250,15617,15400,16877,15065,15374,14656,14409,13632,13072,14862
2002,13332,13784,14095,15667,15249,15547,14568,14115,14339,14181,13172,12957,14251
2003,14233,14528,14393,15519,15334,16251,14177,13861,14048,13688,11781,12607,14202
2004,11988,12716,13002,15212,13331,14229,13152,13371,13184,12707,12056,12193,13095
2005,11850,12588,13037,13329,13144,13767,11489,13581,13057,12789,12121,11866,12718
2006,11883,12322,12638,12906,13156,13426,11465,13317,13068,13089,12169,11715,12596
2007,11798,12243,12883,13117,13206,12992,,12958,12558,12935,11849,11482
2008,11263,12317,12397,13107,12962,12607,12514