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U.S. Percentage Areas (Very Warm/Cold, Very Wet/Dry)
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/total precipitation in the top ten percent (> 90th percentile) of their historical distribution are very warm/wet and those in the bottom ten percent (< 10th percentile) are very cold/dry.
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| December | Very Wet: | Very Dry: |
|---|---|---|
| 1895 | 13.65% | 8.75% |
| 1896 | 0.00% | 26.38% |
| 1897 | 3.45% | 2.49% |
| 1898 | 1.80% | 12.18% |
| 1899 | 0.00% | 2.23% |
| 1900 | 0.00% | 18.81% |
| 1901 | 14.00% | 5.38% |
| 1902 | 16.47% | 1.45% |
| 1903 | 0.48% | 19.75% |
| 1904 | 0.00% | 3.63% |
| 1905 | 9.61% | 20.03% |
| 1906 | 14.99% | 0.36% |
| 1907 | 4.10% | 2.85% |
| 1908 | 2.76% | 16.68% |
| 1909 | 21.72% | 2.08% |
| 1910 | 0.00% | 7.18% |
| 1911 | 23.67% | 1.12% |
| 1912 | 3.26% | 13.98% |
| 1913 | 24.86% | 18.01% |
| 1914 | 12.75% | 10.90% |
| 1915 | 2.46% | 1.00% |
| 1916 | 8.86% | 7.72% |
| 1917 | 9.96% | 41.94% |
| 1918 | 19.16% | 3.56% |
| 1919 | 0.00% | 11.92% |
| 1920 | 4.68% | 3.67% |
| 1921 | 11.95% | 5.76% |
| 1922 | 4.34% | 17.51% |
| 1923 | 19.58% | 1.96% |
| 1924 | 11.34% | 0.75% |
| 1925 | 2.18% | 12.80% |
| 1926 | 14.88% | 2.29% |
| 1927 | 9.63% | 0.65% |
| 1928 | 0.00% | 10.17% |
| 1929 | 6.10% | 17.34% |
| 1930 | 0.36% | 36.80% |
| 1931 | 23.20% | 4.11% |
| 1932 | 15.18% | 4.78% |
| 1933 | 14.67% | 8.95% |
| 1934 | 0.71% | 4.42% |
| 1935 | 3.61% | 9.21% |
| 1936 | 12.17% | 0.37% |
| 1937 | 8.22% | 3.21% |
| 1938 | 1.24% | 7.05% |
| 1939 | 1.12% | 7.63% |
| 1940 | 20.27% | 1.88% |
| 1941 | 12.60% | 1.60% |
| 1942 | 14.15% | 2.07% |
| 1943 | 8.40% | 24.33% |
| 1944 | 6.83% | 13.27% |
| 1945 | 9.62% | 5.17% |
| 1946 | 0.78% | 9.68% |
| 1947 | 4.65% | 6.52% |
| 1948 | 5.37% | 4.33% |
| 1949 | 4.18% | 3.52% |
| 1950 | 1.38% | 30.53% |
| 1951 | 25.53% | 5.19% |
| 1952 | 3.33% | 4.59% |
| 1953 | 9.33% | 4.59% |
| 1954 | 0.33% | 16.18% |
| 1955 | 17.06% | 33.09% |
| 1956 | 1.12% | 13.23% |
| 1957 | 5.77% | 12.64% |
| 1958 | 1.97% | 40.12% |
| 1959 | 7.62% | 11.43% |
| 1960 | 12.47% | 12.76% |
| 1961 | 6.22% | 0.08% |
| 1962 | 0.00% | 14.06% |
| 1963 | 0.45% | 21.92% |
| 1964 | 21.07% | 1.50% |
| 1965 | 15.61% | 14.91% |
| 1966 | 9.03% | 3.90% |
| 1967 | 20.80% | 0.20% |
| 1968 | 13.78% | 0.84% |
| 1969 | 10.96% | 2.80% |
| 1970 | 0.00% | 10.97% |
| 1971 | 17.20% | 2.81% |
| 1972 | 15.41% | 1.17% |
| 1973 | 20.48% | 9.49% |
| 1974 | 0.58% | 2.14% |
| 1975 | 2.38% | 3.08% |
| 1976 | 1.47% | 45.48% |
| 1977 | 17.15% | 7.32% |
| 1978 | 16.06% | 2.44% |
| 1979 | 2.12% | 15.74% |
| 1980 | 2.86% | 26.73% |
| 1981 | 7.80% | 19.56% |
| 1982 | 34.77% | 1.42% |
| 1983 | 26.17% | 1.17% |
| 1984 | 26.16% | 6.38% |
| 1985 | 1.41% | 14.30% |
| 1986 | 8.19% | 24.00% |
| 1987 | 16.24% | 2.57% |
| 1988 | 2.02% | 11.70% |
| 1989 | 4.92% | 36.76% |
| 1990 | 14.88% | 4.68% |
| 1991 | 21.60% | 9.46% |
| 1992 | 10.06% | 1.53% |
| 1993 | 1.85% | 4.77% |
| 1994 | 4.84% | 4.59% |
| 1995 | 2.63% | 6.03% |
| 1996 | 27.72% | 12.91% |
| 1997 | 15.95% | 8.48% |
| 1998 | 1.89% | 9.92% |
| 1999 | 2.38% | 15.96% |
| 2000 | 0.90% | 11.37% |
| 2001 | 3.46% | 11.56% |
| 2002 | 12.35% | 10.13% |
| 2003 | 6.35% | 7.51% |
| 2004 | 5.37% | 8.10% |
| 2005 | 9.08% | 20.26% |
| 2006 | 16.16% | 1.99% |
| 2007 | 29.13% | 2.89% |
| 2008 | 24.43% | 5.25% |
