Table 41. Monthly and annual mixing ratio averages and extremes for CFA(a).

               Average       Highest      Lowest
                (g/kg)       (g/kg)       (g/kg)

January           2.3          7.7          0.16
February          2.5          6.9          0.15
March             3.3          9.1          0.37
April             3.7          9.2          0.65
May               4.9         14.6          0.82
June              5.6         14.3          1.08
July              6.0         16.5          1.21
August            5.7         15.8          1.18
September         4.7         15.1          0.94
October           3.9         11.6          0.54
November          3.1          9.6          0.25
December          2.4          7.4          0.16

ANNUAL            4.0         16.5          0.15

a. Data period of record spans January 1994 through December 2023.