U.S. Percentage Areas (Very Warm/Cold, Very Wet/Dry)

NCDC transitioned to the nClimDiv dataset on Thursday, March 13, 2014. This was coincident with the release of the February 2014 monthly monitoring report. For details on this transition, please visit our public FTP site and our U.S. Climate Divisional Database site.

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 9.29% 4.75%
1896 0.00% 33.23%
1897 3.93% 2.14%
1898 5.52% 13.06%
1899 4.53% 3.47%
1900 1.90% 22.79%
1901 15.23% 9.11%
1902 14.14% 0.00%
1903 1.88% 27.38%
1904 2.48% 4.34%
1905 8.51% 24.03%
1906 21.88% 2.01%
1907 9.60% 7.19%
1908 7.01% 20.38%
1909 18.74% 0.26%
1910 0.00% 6.45%
1911 23.17% 0.00%
1912 4.08% 14.74%
1913 18.25% 19.14%
1914 10.21% 11.60%
1915 5.99% 1.04%
1916 7.64% 6.22%
1917 10.88% 47.60%
1918 21.50% 5.70%
1919 1.89% 15.66%
1920 5.57% 5.36%
1921 14.33% 8.93%
1922 5.81% 18.11%
1923 17.54% 1.10%
1924 12.19% 0.39%
1925 5.33% 12.83%
1926 17.86% 1.05%
1927 14.10% 1.10%
1928 0.00% 13.77%
1929 7.16% 22.17%
1930 0.65% 45.52%
1931 23.79% 2.88%
1932 15.01% 4.53%
1933 13.83% 7.49%
1934 0.00% 4.08%
1935 1.84% 10.63%
1936 9.76% 0.00%
1937 7.40% 3.24%
1938 2.11% 8.34%
1939 0.50% 8.10%
1940 19.59% 4.45%
1941 10.78% 2.27%
1942 13.14% 0.62%
1943 9.08% 25.73%
1944 7.33% 13.85%
1945 9.47% 4.25%
1946 1.16% 9.60%
1947 5.43% 5.80%
1948 5.80% 3.25%
1949 5.32% 3.47%
1950 0.00% 30.51%
1951 20.66% 6.63%
1952 2.32% 5.90%
1953 8.62% 3.82%
1954 0.69% 19.19%
1955 17.32% 34.08%
1956 1.28% 13.71%
1957 6.16% 12.76%
1958 1.23% 41.86%
1959 7.92% 10.20%
1960 13.24% 13.00%
1961 6.83% 1.01%
1962 0.00% 14.61%
1963 0.45% 20.91%
1964 20.77% 0.86%
1965 17.25% 15.66%
1966 9.29% 4.15%
1967 19.77% 0.53%
1968 13.41% 0.84%
1969 11.99% 3.02%
1970 0.00% 10.60%
1971 17.45% 2.89%
1972 16.52% 1.17%
1973 19.71% 9.94%
1974 0.45% 1.91%
1975 2.05% 6.19%
1976 1.47% 46.00%
1977 18.00% 7.82%
1978 14.87% 2.36%
1979 1.65% 17.19%
1980 1.18% 26.67%
1981 6.45% 18.60%
1982 32.12% 1.18%
1983 24.62% 1.17%
1984 25.64% 5.67%
1985 1.07% 13.90%
1986 8.83% 26.58%
1987 15.32% 2.82%
1988 0.27% 11.48%
1989 4.10% 36.76%
1990 14.93% 5.05%
1991 21.73% 10.82%
1992 10.57% 1.57%
1993 1.18% 3.42%
1994 5.36% 4.97%
1995 4.09% 5.25%
1996 27.94% 11.88%
1997 14.21% 9.27%
1998 0.97% 9.91%
1999 2.38% 14.81%
2000 0.72% 11.67%
2001 1.86% 12.66%
2002 9.57% 9.97%
2003 4.38% 7.74%
2004 3.51% 7.85%
2005 7.95% 20.53%
2006 15.48% 2.23%
2007 23.38% 1.47%
2008 19.37% 6.43%
2009 22.81% 1.18%
2010 21.56% 12.49%
2011 12.02% 13.20%