Year,Jan.,Feb.,Mar.,Apr.,May.,Jun.,Jul.,Aug.,Sep.,Oct.,Nov.,Dec.,24-Hour Annual Avg.,
2011,,,,,,,,,,,20057,20690,,
2012,19003,20666,21370,22312,22575,23023,23481,23836,22910,22852,22007,21407,22120,
2013,19373,21380,22408,22970,23244,23736,23312,23924,23485,23276,22119,21308,22544,
2014,20657,21772,23524,24285,24954,25615,25506,25727,24948,25045,23243,23556,24069,
2015,22139,24355,25660,26222,26711,27986,28036,27934,27220,27161,25246,24623,26108,
2016,23312,25804,27127,28210,28607,,28325,,27270,27681,26669,24417,,
2017,21397,25105,28062,29131,29409,30559,29901,29068,28001,28343,26990,26155,27677,
2018,24832,26057,27618,28596,29429,29946,29762,29958,29042,28857,27553,25968,28135,
2019,24972,25000,28173,29805,29830,30917,30230,30173,31184,29631,28116,26431,28705,
2020,25411,27503,24919,19425,25326,29774,29925,30015,28723,27763,25069,26189,26670,
2021,25856,26634,28541,29112,29980,36404,32674,31742,30565,30257,29341,26922,29836,
2022,25361,28302,29187,30323,30808,29731,29102,32074,31260,31288,28626,27003,29422,
2023,26874,28144,29029,31379,32213,33389,32772,31928,29563,30008,27982,27152,30036,
2024,24122,28113,28211, , , , , , , , , , ,