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| September |
|---|
| Very Warm: |
| Very Cold: |
| 1895 | 1896 | 1897 | 1898 | 1899 | 1900 | 1901 | 1902 | 1903 | 1904 | 1905 | 1906 | 1907 | 1908 | 1909 | 1910 | 1911 | 1912 | 1913 | 1914 | 1915 | 1916 | 1917 | 1918 | 1919 | 1920 | 1921 | 1922 | 1923 | 1924 | 1925 | 1926 | 1927 | 1928 | 1929 | 1930 | 1931 | 1932 | 1933 | 1934 | 1935 | 1936 | 1937 | 1938 | 1939 | 1940 | 1941 | 1942 | 1943 | 1944 | 1945 | 1946 | 1947 | 1948 | 1949 | 1950 | 1951 | 1952 | 1953 | 1954 | 1955 | 1956 | 1957 | 1958 | 1959 | 1960 | 1961 | 1962 | 1963 | 1964 | 1965 | 1966 | 1967 | 1968 | 1969 | 1970 | 1971 | 1972 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 33.27% | 5.83% | 27.96% | 8.64% | 9.29% | 28.28% | 0.73% | 1.64% | 0.59% | 1.08% | 8.20% | 27.51% | 1.01% | 15.59% | 0.00% | 18.28% | 37.96% | 10.68% | 2.94% | 0.59% | 6.13% | 0.00% | 0.00% | 2.57% | 3.25% | 8.56% | 46.07% | 23.53% | 2.33% | 0.00% | 37.41% | 18.93% | 7.67% | 0.00% | 0.97% | 16.81% | 59.41% | 2.19% | 60.81% | 4.62% | 2.88% | 28.34% | 4.67% | 18.62% | 34.88% | 18.00% | 10.74% | 0.00% | 5.84% | 2.63% | 12.40% | 3.18% | 17.28% | 22.65% | 4.92% | 0.10% | 4.25% | 6.85% | 5.69% | 34.16% | 2.46% | 16.53% | 1.85% | 1.00% | 6.45% | 6.57% | 11.57% | 0.84% | 27.34% | 0.00% | 0.27% | 6.45% | 15.27% | 1.35% | 4.91% | 14.12% | 6.32% | 5.83% | 1.14% | 5.41% | 0.90% | 0.00% | 11.11% | 18.29% | 26.45% | 16.29% | 3.71% | 1.20% | 16.04% | 4.90% | 0.02% | 4.09% | 1.59% | 0.84% | 1.65% | 27.82% | 5.90% | 0.85% | 1.09% | 13.33% | 6.83% | 0.52% | 16.70% | 70.20% | 3.37% | 10.67% | 18.64% | 15.57% | 10.73% | 6.70% | 39.26% | 0.09% | 7.09% | 1.36% | 31.86% | 24.02% | 31.64% | 14.61% |
| 11.81% | 22.63% | 5.62% | 1.20% | 3.15% | 11.06% | 18.01% | 20.15% | 15.93% | 3.33% | 0.25% | 1.28% | 6.71% | 1.50% | 0.74% | 2.20% | 11.83% | 40.60% | 21.30% | 10.43% | 12.24% | 6.89% | 8.66% | 57.78% | 2.18% | 7.40% | 11.74% | 1.12% | 11.09% | 30.79% | 11.04% | 28.12% | 9.79% | 20.29% | 16.04% | 6.81% | 4.14% | 6.88% | 5.76% | 16.12% | 9.19% | 1.15% | 2.06% | 2.25% | 2.28% | 10.85% | 28.44% | 12.23% | 14.19% | 0.00% | 2.84% | 0.56% | 0.00% | 1.03% | 21.67% | 6.82% | 17.72% | 0.11% | 0.00% | 1.01% | 0.00% | 11.69% | 1.23% | 0.00% | 2.42% | 0.10% | 38.37% | 8.84% | 9.16% | 5.47% | 48.75% | 7.16% | 33.20% | 11.74% | 1.40% | 21.85% | 19.85% | 8.34% | 6.05% | 47.79% | 42.62% | 11.86% | 0.32% | 6.05% | 3.22% | 0.59% | 4.97% | 1.32% | 4.77% | 23.91% | 36.70% | 28.90% | 1.65% | 4.81% | 15.17% | 0.04% | 10.94% | 0.51% | 26.29% | 5.21% | 5.98% | 13.43% | 0.00% | 0.00% | 2.91% | 1.06% | 5.93% | 0.00% | 6.43% | 0.48% | 1.73% | 31.31% | 0.00% | 4.30% | 1.43% | 0.34% | 1.77% | 0.04% |
The percentage areas of the contiguous United States are computed based on the climate division data set. Those climate divisions having the monthly average temperature in the top ten percent (> 90th percentile) of their historical distribution are very warm and those in the bottom ten percent (< 10th percentile) are very cold.
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http://www.ncdc.noaa.gov/temp-and-precip/uspa/index.php