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| December |
|---|
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 13.65% | 0.00% | 3.45% | 1.80% | 0.00% | 0.00% | 14.00% | 16.47% | 0.48% | 0.00% | 9.61% | 14.99% | 4.10% | 2.76% | 21.72% | 0.00% | 23.67% | 3.26% | 24.86% | 12.75% | 2.46% | 8.86% | 9.96% | 19.16% | 0.00% | 4.68% | 11.95% | 4.34% | 19.58% | 11.34% | 2.18% | 14.88% | 9.63% | 0.00% | 6.10% | 0.36% | 23.20% | 15.18% | 14.67% | 0.71% | 3.61% | 12.17% | 8.22% | 1.24% | 1.12% | 20.27% | 12.60% | 14.15% | 8.40% | 6.83% | 9.62% | 0.78% | 4.65% | 5.37% | 4.18% | 1.38% | 25.53% | 3.33% | 9.33% | 0.33% | 17.06% | 1.12% | 5.77% | 1.97% | 7.62% | 12.47% | 6.22% | 0.00% | 0.45% | 21.07% | 15.61% | 9.03% | 20.80% | 13.78% | 10.96% | 0.00% | 17.20% | 15.41% | 20.48% | 0.58% | 2.38% | 1.47% | 17.15% | 16.06% | 2.12% | 2.86% | 7.80% | 34.77% | 26.17% | 26.16% | 1.41% | 8.19% | 16.24% | 2.02% | 4.92% | 14.88% | 21.60% | 10.06% | 1.85% | 4.84% | 2.63% | 27.72% | 15.95% | 1.89% | 2.38% | 0.90% | 3.46% | 12.35% | 6.35% | 5.37% | 9.08% | 16.16% | 29.13% | 24.43% | 25.60% | 23.36% | 13.76% | 9.88% |
| 8.75% | 26.38% | 2.49% | 12.18% | 2.23% | 18.81% | 5.38% | 1.45% | 19.75% | 3.63% | 20.03% | 0.36% | 2.85% | 16.68% | 2.08% | 7.18% | 1.12% | 13.98% | 18.01% | 10.90% | 1.00% | 7.72% | 41.94% | 3.56% | 11.92% | 3.67% | 5.76% | 17.51% | 1.96% | 0.75% | 12.80% | 2.29% | 0.65% | 10.17% | 17.34% | 36.80% | 4.11% | 4.78% | 8.95% | 4.42% | 9.21% | 0.37% | 3.21% | 7.05% | 7.63% | 1.88% | 1.60% | 2.07% | 24.33% | 13.27% | 5.17% | 9.68% | 6.52% | 4.33% | 3.52% | 30.53% | 5.19% | 4.59% | 4.59% | 16.18% | 33.09% | 13.23% | 12.64% | 40.12% | 11.43% | 12.76% | 0.08% | 14.06% | 21.92% | 1.50% | 14.91% | 3.90% | 0.20% | 0.84% | 2.80% | 10.97% | 2.81% | 1.17% | 9.49% | 2.14% | 3.08% | 45.48% | 7.32% | 2.44% | 15.74% | 26.73% | 19.56% | 1.42% | 1.17% | 6.38% | 14.30% | 24.00% | 2.57% | 11.70% | 36.76% | 4.68% | 9.46% | 1.53% | 4.77% | 4.59% | 6.03% | 12.91% | 8.48% | 9.92% | 15.96% | 11.37% | 11.56% | 10.13% | 7.51% | 8.10% | 20.26% | 1.99% | 2.89% | 5.25% | 2.01% | 11.30% | 12.31% | 2.70% |
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