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 U.S. Climate Divisional Dataset. 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%
1899 4.53% 3.47%
1901 15.23% 9.11%
1903 1.88% 27.38%
1905 8.51% 24.03%
1907 9.60% 7.19%
1909 18.74% 0.26%
1911 23.17% 0.00%
1913 18.25% 19.14%
1915 5.99% 1.04%
1917 10.88% 47.60%
1919 1.89% 15.66%
1921 14.33% 8.93%
1923 17.54% 1.10%
1925 5.33% 12.83%
1927 14.10% 1.10%
1929 7.16% 22.17%
1931 23.79% 2.88%
1933 13.83% 7.49%
1935 1.84% 10.63%
1937 7.40% 3.24%
1939 0.50% 8.10%
1941 10.78% 2.27%
1943 9.08% 25.73%
1945 9.47% 4.25%
1947 5.43% 5.80%
1949 5.32% 3.47%
1951 20.66% 6.63%
1953 8.62% 3.82%
1955 17.32% 34.08%
1957 6.16% 12.76%
1959 7.92% 10.20%
1961 6.83% 1.01%
1963 0.45% 20.91%
1965 17.25% 15.66%
1967 19.77% 0.53%
1969 11.99% 3.02%
1971 17.45% 2.89%
1973 19.71% 9.94%
1975 2.05% 6.19%
1977 18.00% 7.82%
1979 1.65% 17.19%
1981 6.45% 18.60%
1983 24.62% 1.17%
1985 1.07% 13.90%
1987 15.32% 2.82%
1989 4.10% 36.76%
1991 21.73% 10.82%
1993 1.18% 3.42%
1995 4.09% 5.25%
1997 14.21% 9.27%
1999 2.38% 14.81%
2001 1.86% 12.66%
2003 4.38% 7.74%
2005 7.95% 20.53%
2007 23.38% 1.47%
2009 22.81% 1.18%
2011 12.02% 13.20%
2013 11.98% 10.18%