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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May Very Wet: Very Dry:
1895 7.89% 7.46%
1896 21.17% 18.95%
1897 3.18% 24.02%
1898 24.37% 9.18%
1899 5.36% 18.31%
1900 8.91% 14.57%
1901 11.28% 15.18%
1902 9.54% 3.32%
1903 12.12% 13.40%
1904 2.56% 5.84%
1905 16.52% 2.81%
1906 21.49% 3.92%
1907 14.66% 5.26%
1908 24.72% 0.00%
1909 4.37% 11.03%
1910 2.35% 17.13%
1911 5.01% 31.41%
1912 10.69% 5.28%
1913 3.41% 16.44%
1914 11.62% 16.74%
1915 28.24% 3.36%
1916 2.74% 9.69%
1917 14.75% 12.23%
1918 4.65% 11.74%
1919 7.27% 8.62%
1920 3.91% 15.08%
1921 9.51% 11.70%
1922 7.76% 2.01%
1923 11.84% 8.77%
1924 3.11% 28.97%
1925 2.40% 26.49%
1926 5.12% 12.60%
1927 16.22% 20.45%
1928 11.89% 21.23%
1929 17.86% 14.02%
1930 16.72% 8.18%
1931 1.51% 12.30%
1932 3.40% 13.60%
1933 12.34% 2.53%
1934 3.80% 41.96%
1935 24.13% 7.66%
1936 6.84% 27.14%
1937 3.22% 15.51%
1938 10.59% 4.76%
1939 0.42% 18.74%
1940 3.95% 21.90%
1941 16.71% 20.65%
1942 20.95% 16.25%
1943 9.23% 5.54%
1944 6.69% 2.81%
1945 11.70% 18.29%
1946 16.44% 2.46%
1947 11.78% 6.20%
1948 10.43% 14.44%
1949 9.01% 3.91%
1950 3.99% 12.49%
1951 4.27% 13.10%
1952 0.09% 8.89%
1953 16.39% 6.83%
1954 2.94% 7.33%
1955 5.86% 4.74%
1956 5.49% 5.04%
1957 43.26% 1.07%
1958 2.19% 10.39%
1959 9.87% 4.85%
1960 9.37% 9.50%
1961 7.20% 7.65%
1962 15.75% 22.54%
1963 2.30% 18.51%
1964 1.40% 13.60%
1965 13.90% 14.69%
1966 4.35% 22.89%
1967 5.32% 6.88%
1968 7.05% 1.64%
1969 5.89% 10.29%
1970 8.04% 17.20%
1971 10.72% 4.14%
1972 8.95% 5.94%
1973 8.65% 6.45%
1974 8.95% 22.03%
1975 8.31% 4.98%
1976 10.86% 10.22%
1977 17.18% 15.44%
1978 12.92% 2.18%
1979 14.64% 1.07%
1980 17.88% 11.68%
1981 20.10% 2.27%
1982 19.45% 7.17%
1983 13.97% 3.20%
1984 12.35% 11.65%
1985 2.06% 5.74%
1986 2.29% 4.08%
1987 18.41% 3.48%
1988 2.56% 23.63%
1989 10.98% 4.71%
1990 20.81% 3.40%
1991 19.11% 5.42%
1992 12.06% 25.64%
1993 6.64% 6.29%
1994 5.69% 10.86%
1995 34.15% 0.73%
1996 21.48% 14.46%
1997 1.77% 5.16%
1998 18.03% 25.40%
1999 6.98% 4.48%
2000 4.00% 20.62%
2001 8.08% 15.59%
2002 6.05% 23.55%
2003 14.64% 5.45%
2004 18.86% 17.73%
2005 16.31% 11.12%
2006 4.11% 14.45%
2007 16.45% 23.62%
2008 9.13% 4.93%
2009 15.17% 6.24%
2010 12.54% 4.07%
2011 26.39% 15.54%
2012 5.90% 20.53%