Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual 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,
2011,3433,3729,3693,3826,3716,3777,3523,3702,3529,3525,3378,3381,3601,
2012,3434,3637,3598,3743,3596,3565,3356,3405,3387,3455,3291,3250,3476,
2013,3180,3452,3540,3653,3573,3523,3338,3333,3423,3390,3206,3125,3395,
2014,3138,3482,3487,3588,3515,3426,3322,3209,3227,3244,3097,3019,3313,
2015,3095,3423,3362,3460,3315,3333,3171,3180,3181,3270,3024,2966,3232,
2016,3036,3247,3246,3427,3366,3356,3242,3184,3125,3186,2994,2897,3192,
2017,2831,3160,3334,3420,3445,3465,,,,,,,,
2018, , , , , , , , , , , , , ,
2019, , , , , , , , ,3178,3145,2963,2910, ,
2020,2967,3153,2719,2206,2750,3095,3059,3027,2966,2976,2684,2730,2861,
2021,2818,2917,3388,3287,3222,3175,3070,2991,3050,3094,2884,2742,3053,
2022,2734,2974,3034,3168,3106,3024,2911,2893,2962,3046,2797,2686,2945,
2023,2856,2992,3015,3180,3211,3227,2928,2952,2950,3047,2934,2838,3011,
2024,2849,3131,3112, , , , , , , , , , ,