YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,2818,3026,3395,3719,4051,4442,4652,4696,4119,3942,3516,2836,3772
1991,2833,3204,3479,3732,4104,4513,4753,4898,4224,4289,3492,3324,3909
1992,3146,3443,3719,4096,4383,4711,5005,5107,4619,4534,3914,3552,4200
1993,3227,3405,3808,4061,4345,4828,5228,5209,4549,4395,3609,3373,4175
1994,3200,3223,3771,3966,4348,4621,4965,5108,4551,4153,3648,3563,4099
1995,3290,3498,3706,4036,4587,,, ,4803,4665,4048,3836
1996,3128,3611,4040,4294,4714,5092,5531,5551,5009,4736,4098,3461,4439
1997,3494,3735,4061,4149,4706,5034,5574,5606,5059,4998,4426,4007,4571
1998,3498,3869,4152,4418,4872,5239,5625,5687,5104,4960,4351,3991,4647
1999,3754,3817,4273,4424,4974,5380,5780,5989,5370,5182,4589,4207,4812
2000,3847,4142,4446,4760,5152,5622,5881,5933,5329,5140,4390,4022,4889
2001,3884,4166,4661,4910,5213,,,,,4755,4447,3642
2002,3612,3933,4177,4476,5068,5281,5585,5711,5123,4962,4393,3820,4678
2003,3833,3833,4070,4421,4902,5234,5756,5724,5243,5030,4140,3775,4663
2004,3367,3604,4196,4451,4715,5035,5506,5418,5103,4805,4207,3823,4519
2005,3285,3762,4093,4317,4612,5154,5473,5362,4832,4636,4154,3719,4450
2006,3370,3644,3995,4262,4675,5006,5301,5260,4916,4715,4161,3748,4421
2007,3546,3826,4191,4313,4655,5142,5462,5529,5233,5009,4422,3631,4580
2008,3239,3501,3951,4171,4600,4802,5034,,4860,4602,4095,3626
2009,3485,3731,3868,4213,4725,5124,5586,5352,5100