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| January |
|---|
| 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 | 2013 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 21.12% | 5.91% | 21.62% | 19.81% | 4.40% | 2.40% | 0.59% | 0.00% | 5.92% | 1.01% | 10.09% | 16.22% | 43.36% | 0.00% | 26.55% | 9.37% | 22.40% | 4.34% | 14.38% | 21.45% | 17.27% | 55.87% | 6.68% | 14.46% | 2.60% | 9.88% | 2.43% | 2.32% | 2.49% | 0.16% | 5.94% | 8.59% | 0.29% | 0.00% | 9.17% | 12.07% | 4.35% | 23.25% | 7.86% | 3.11% | 5.54% | 18.01% | 30.58% | 6.44% | 12.42% | 9.47% | 7.82% | 0.27% | 13.40% | 13.86% | 0.92% | 12.47% | 9.59% | 3.45% | 48.14% | 28.13% | 3.49% | 13.11% | 8.27% | 7.62% | 0.82% | 9.32% | 8.31% | 9.90% | 3.26% | 9.73% | 1.29% | 3.60% | 1.42% | 6.12% | 7.00% | 3.29% | 7.95% | 8.31% | 32.70% | 9.69% | 9.28% | 8.03% | 5.31% | 13.83% | 12.13% | 1.99% | 0.88% | 26.66% | 32.35% | 19.99% | 0.00% | 15.56% | 3.69% | 0.10% | 1.81% | 1.74% | 5.68% | 2.66% | 3.59% | 8.66% | 8.97% | 9.15% | 28.27% | 6.02% | 17.99% | 20.67% | 23.58% | 23.43% | 23.73% | 2.50% | 7.59% | 0.81% | 0.77% | 2.70% | 32.24% | 7.74% | 12.83% | 7.70% | 1.99% | 18.21% | 6.98% | 2.33% | 10.11% |
| 0.00% | 6.20% | 2.69% | 14.65% | 2.01% | 13.91% | 7.01% | 13.42% | 5.50% | 13.20% | 1.70% | 0.00% | 13.67% | 0.97% | 18.06% | 1.01% | 11.63% | 18.35% | 1.23% | 16.88% | 2.73% | 6.16% | 6.35% | 5.32% | 25.02% | 9.45% | 3.37% | 2.16% | 3.21% | 7.93% | 13.05% | 1.20% | 17.24% | 29.89% | 1.45% | 2.36% | 26.26% | 0.33% | 7.10% | 10.26% | 7.50% | 5.04% | 1.36% | 3.33% | 0.16% | 8.47% | 6.20% | 14.01% | 11.67% | 11.85% | 6.32% | 7.12% | 7.63% | 13.68% | 11.68% | 6.60% | 8.77% | 3.89% | 7.18% | 9.10% | 9.07% | 8.25% | 7.13% | 5.32% | 10.81% | 0.08% | 37.35% | 3.22% | 16.05% | 7.50% | 2.45% | 7.80% | 15.70% | 3.77% | 8.34% | 23.78% | 13.53% | 13.62% | 4.80% | 3.93% | 3.09% | 24.68% | 8.72% | 0.00% | 2.25% | 3.17% | 48.63% | 0.10% | 9.05% | 19.51% | 17.00% | 37.23% | 6.53% | 4.30% | 6.88% | 2.53% | 7.20% | 8.96% | 0.00% | 3.99% | 1.66% | 5.99% | 1.06% | 3.93% | 2.88% | 5.82% | 11.51% | 10.70% | 30.68% | 6.66% | 3.28% | 9.68% | 16.55% | 10.15% | 18.11% | 3.00% | 17.09% | 8.23% | 8.70% |
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