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September Temperature Statistics

The following table lists the daily mean and record temperatures (°F) at Brookhaven National Laboratory for each day of the month. The period covered is from 1949 to 2006.

Maximum Minimum
Day Mean Average High Year Average Low Year
1 68.0 78.4 92.0 1953 57.6 41.0 1971
2 67.2 77.6 100.0 1953 56.9 41.0 1991
3 67.1 77.5 93.0 1953 56.7 37.5 1958
4 67.3 78.0 91.0 1985 56.7 40.0 1987
5 66.6 77.4 91.5 1985 55.9 40.0 1965
6 66.1 77.6 91.5 1983 54.5 37.0 1962
7 65.6 77.3 90.0 1983 53.9 36.0 1984
8 64.8 76.2 86.0 1985 53.5 36.0 1952
9 64.7 76.1 88.0 1959, 2002 53.3 33.0 1952
10 65.9 76.9 91.0 1983 54.8 34.5 1975
11 64.6 75.8 96.0 1983 53.5 37.5 1972
12 64.0 75.4 92.5 2005 52.6 34.0 1958
13 64.3 75.3 91.5 2005 53.3 35.0 1954
14 64.5 74.6 88.0 1972 54.4 34.0 1975
15 63.0 73.1 83.0 2005 52.9 33.0 1975
16 63.1 73.3 86.0 1991 52.9 31.5 1964
17 62.2 72.4 87.5 1991 52.1 34.0 1950
18 62.2 73.0 84.5 1965 51.3 29.0 1959
19 62.0 73.2 90.0 1983 50.7 30.0 1956
20 61.7 71.8 90.0 1983 51.5 33.5 1979
21 61.9 71.9 85.0 1980 51.8 30.0 1956
22 61.2 71.5 90.5 1980 51.0 28.0 1962
23 60.7 70.6 92.0 1970 50.8 28.0 1953
24 58.3 69.4 86.5 1970 47.1 25.0 1953
25 57.8 69.0 84.0 1984 46.6 29.5 1963
26 59.4 70.5 85.5 1970 48.3 32.0 1963
27 58.9 70.1 86.5 1998 47.7 28.0 1978
28 59.0 69.3 80.0 1959 48.8 30.0 1965
29 57.7 68.0 80.5 1959 47.5 29.5 1957
30 56.8 67.9 82.0 1986 45.6 27.0 1951
Mean 62.9 73.6 88.5 52.1 33.2