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| September |
|---|
| Very Wet: |
| Very Dry: |
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.71% | 4.61% | 3.31% | 7.06% | 0.09% | 9.91% | 5.94% | 0.52% | 3.91% | 8.52% | 4.99% | 9.15% | 7.12% | 2.55% | 6.06% | 2.48% | 8.66% | 8.64% | 9.52% | 2.23% | 8.81% | 0.09% | 3.25% | 14.87% | 6.02% | 3.77% | 9.69% | 0.08% | 13.25% | 11.07% | 5.16% | 19.00% | 12.53% | 6.89% | 11.97% | 4.50% | 4.23% | 7.08% | 4.57% | 10.66% | 5.01% | 14.66% | 0.22% | 11.95% | 9.61% | 17.63% | 24.51% | 5.53% | 1.95% | 5.32% | 19.17% | 9.59% | 3.54% | 1.92% | 1.09% | 10.16% | 5.28% | 1.17% | 3.03% | 5.49% | 2.45% | 2.49% | 14.33% | 10.92% | 18.52% | 3.98% | 21.08% | 6.43% | 6.72% | 5.65% | 24.16% | 4.24% | 9.49% | 5.81% | 2.11% | 13.30% | 7.92% | 5.12% | 26.33% | 12.11% | 11.66% | 11.00% | 19.93% | 17.68% | 15.97% | 13.02% | 2.92% | 16.71% | 8.55% | 2.51% | 18.32% | 33.15% | 3.78% | 8.17% | 12.18% | 2.33% | 7.39% | 3.11% | 7.86% | 1.20% | 1.86% | 19.33% | 11.20% | 12.71% | 11.18% | 3.97% | 3.74% | 11.93% | 12.07% | 21.87% | 4.20% | 9.83% | 2.59% | 11.96% | 10.32% | 15.76% | 11.42% | 5.39% |
| 14.07% | 0.57% | 24.33% | 13.29% | 19.46% | 2.01% | 4.17% | 5.78% | 14.80% | 7.61% | 0.35% | 6.40% | 2.75% | 17.85% | 6.15% | 4.60% | 0.47% | 2.86% | 2.66% | 11.95% | 4.67% | 1.73% | 7.00% | 6.55% | 9.72% | 2.38% | 3.13% | 23.05% | 4.26% | 7.23% | 2.52% | 10.25% | 7.09% | 20.04% | 6.33% | 4.42% | 16.14% | 20.10% | 6.16% | 4.37% | 12.87% | 3.61% | 8.14% | 8.32% | 24.86% | 20.07% | 9.89% | 7.68% | 21.09% | 6.27% | 2.13% | 2.10% | 11.17% | 19.46% | 2.15% | 3.20% | 6.19% | 20.48% | 42.12% | 15.75% | 13.49% | 42.07% | 12.75% | 5.14% | 7.75% | 10.51% | 5.97% | 0.47% | 6.39% | 10.90% | 3.27% | 2.91% | 3.14% | 13.35% | 4.05% | 2.19% | 1.31% | 4.89% | 7.68% | 22.35% | 12.28% | 7.66% | 2.44% | 11.97% | 28.33% | 4.48% | 3.88% | 4.09% | 4.29% | 12.56% | 8.14% | 3.55% | 13.49% | 2.40% | 6.75% | 15.54% | 7.30% | 4.15% | 12.72% | 1.70% | 6.84% | 0.36% | 3.11% | 10.90% | 16.08% | 12.50% | 2.27% | 3.59% | 1.09% | 13.63% | 11.67% | 4.92% | 1.87% | 10.60% | 9.99% | 13.66% | 11.35% | 24.77% |
The percentage areas of the contiguous United States are computed based on the climate division data set. Those climate divisions having the monthly total precipitation in the top ten percent (> 90th percentile) of their historical distribution are very wet and those in the bottom ten percent (< 10th percentile) are very dry.
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http://www.ncdc.noaa.gov/temp-and-precip/uspa/index.php