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| May |
|---|
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 7.84% | 23.37% | 6.27% | 27.24% | 1.95% | 6.09% | 7.06% | 12.22% | 9.93% | 0.95% | 14.59% | 24.45% | 11.77% | 28.58% | 5.89% | 0.00% | 5.74% | 13.84% | 3.32% | 10.31% | 28.30% | 1.35% | 18.37% | 5.27% | 3.00% | 0.56% | 9.65% | 4.44% | 10.75% | 3.10% | 4.17% | 0.25% | 14.90% | 4.07% | 20.16% | 15.57% | 2.76% | 1.34% | 12.37% | 4.20% | 22.80% | 5.43% | 4.55% | 10.01% | 0.95% | 3.34% | 16.26% | 21.10% | 10.78% | 8.04% | 11.36% | 14.48% | 12.44% | 8.86% | 8.27% | 5.39% | 4.63% | 0.17% | 16.96% | 2.11% | 6.63% | 4.97% | 42.42% | 1.82% | 8.86% | 9.10% | 7.68% | 18.72% | 1.80% | 2.36% | 13.30% | 4.35% | 3.91% | 7.01% | 4.64% | 7.77% | 11.07% | 8.93% | 10.13% | 10.05% | 8.62% | 10.68% | 15.03% | 11.56% | 13.19% | 17.84% | 19.38% | 20.41% | 12.11% | 13.58% | 1.97% | 2.60% | 18.66% | 1.75% | 11.39% | 21.15% | 18.83% | 12.57% | 9.10% | 5.02% | 32.62% | 22.02% | 3.40% | 17.60% | 7.19% | 4.45% | 7.21% | 6.98% | 13.77% | 20.17% | 16.86% | 3.56% | 17.28% | 10.79% | 17.04% | 12.17% | 21.17% | 6.11% |
| 5.40% | 18.12% | 22.11% | 8.70% | 17.32% | 12.50% | 12.37% | 3.43% | 15.21% | 4.90% | 3.21% | 7.17% | 0.77% | 0.32% | 9.03% | 13.12% | 30.67% | 6.44% | 9.44% | 15.31% | 1.77% | 3.22% | 5.69% | 7.85% | 2.14% | 6.88% | 11.71% | 0.15% | 7.73% | 27.90% | 19.31% | 10.20% | 18.27% | 16.07% | 12.87% | 4.64% | 14.53% | 13.65% | 2.79% | 45.72% | 7.43% | 26.06% | 14.71% | 3.43% | 18.54% | 20.71% | 20.24% | 15.01% | 4.89% | 3.64% | 18.17% | 1.77% | 6.42% | 12.45% | 4.73% | 10.96% | 13.56% | 8.10% | 7.70% | 8.77% | 4.47% | 5.16% | 1.09% | 9.23% | 4.92% | 5.95% | 9.59% | 20.77% | 17.76% | 12.22% | 15.49% | 24.12% | 8.34% | 1.78% | 10.42% | 16.57% | 5.85% | 4.27% | 7.15% | 21.45% | 4.21% | 10.29% | 13.81% | 3.55% | 2.00% | 10.56% | 2.50% | 7.52% | 2.62% | 13.27% | 4.85% | 6.80% | 4.14% | 23.63% | 5.30% | 1.73% | 4.88% | 25.40% | 6.25% | 10.94% | 1.13% | 14.26% | 6.21% | 24.97% | 4.48% | 18.75% | 15.53% | 19.85% | 6.09% | 14.97% | 10.83% | 12.73% | 19.72% | 6.42% | 9.83% | 4.88% | 16.22% | 19.96% |
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