Table 5.4-1. Monthly and annual averages and extremes of hourly wet bulb temperatures for CFA(a).

                       Monthly Values
                          Highest   Lowest       Five-Minute Extreme Values
                Average   Average   Average         Maximum      Minimum
               (deg F.)  (deg F.)  (deg F.)        (deg F.)     (deg F.)

January           16.3      22.7       9.9            47.9        -28.9
February          18.0      27.7       7.0            48.2        -31.3
March             29.3      31.8      22.6            49.9        -17.7
April             36.0      37.6      33.0            56.0          4.8
May               43.4      48.1      41.1            66.0         12.7
June              48.1      50.4      46.7            63.3         22.0
July              52.3      55.7      47.4            67.1         24.2
August            50.6      52.9      48.0            65.6         21.3
September         43.9      50.9      40.3            65.6         11.3
October           35.1      38.8      30.8            57.2         -6.9
November          25.1      31.1      17.1            51.9        -25.4
December          17.5      23.1       8.9            46.8        -30.6

ANNUAL            35.5      38.1      32.8            67.1        -31.3

a. Data period of record spans April 1993 through March 2006.