YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1990,3117,3298,3397,3539,3471,3482,3393,3447,3171,3444,2410,2857,3253
1991,2902,3187,3215,3426,3357,3369,3399,3417,3144,3424,3204,3299,3279
1992,3244,3380,3507,3592,3480,3742,3607,3694,4066,3300,3135,3248,3508
1993,3043,3141,3508,3589,3475,3704,3450,3442,3365,3396,3358,3340,3402
1994,3296,3488,3657,,,,,,3420,3454,3415,3397
1995,
1996,,,,,,,,,,4240,4074,3971
1997,3964,4276,4293,4507,4363,4413,4172,4169,4101,4200,4023,3988,4206
1998,3886,3933,4133,4270,4219,4324,4428,4460,4234,4496,4215,4219,4235
1999,3992,4125,4280,4197,4311,4444,4202,4095,4179,4271,4063,4100,4188
2000,4048,4237,4347,4320,4292,4113,3750,3906,3953,4079,3939,4049,4086
2001,3962,4180,4393,4339,4338,4263,4037,4155,4073,4191,4120,3861,4159
2002,4008,4214,4214,4440,4994,4205,4180,4130,4099,4298,4065,4072,4243
2003,4064,4149,4003,4340,4289,4245,4052,4332,3628,4177,3762,3910,4079
2004,3766,3854,4221,4430,4140,4212,4076,3998,3986,4005,3963,4032,4057
2005,3816,4166,4253,4338,4247,4207,3898,4094,4121,4114,3937,3888,4090
2006,3883,4150,4368,4307,4317,4217,3871,4012,3979,4022,3871,3659,4055
2007,3754,3964,4032,4141,4115,4049,3795,4035,3762,4066,3794,3554,3922
2008,3706,3877,3855,4165,4035,3972,3870,3727,3850,3859,3590,3607,3843
2009,3615,3856,3791,4054,3886,3902,3776,3698,3684,3709,3492,3467,3744
2010,3417,3691,3794,3966,3725,3785,3642,3648,3665,3675,3507,3475,3666
2011,3433,3729,3693,3826,3716,3777,3523,3702,3529,3525