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 Warm: Very Cold:
1895 0.00% 12.49%
1896 20.66% 0.00%
1897 0.00% 10.78%
1899 0.00% 5.49%
1901 0.00% 2.57%
1903 0.00% 27.81%
1905 0.00% 28.64%
1907 0.00% 0.00%
1909 0.00% 80.61%
1911 3.88% 24.89%
1913 10.67% 12.20%
1915 0.00% 1.10%
1917 23.44% 54.82%
1919 0.00% 37.38%
1921 17.33% 0.39%
1923 41.22% 1.85%
1925 2.79% 4.74%
1927 0.00% 43.96%
1929 15.32% 0.00%
1931 38.34% 16.72%
1933 48.97% 3.62%
1935 0.00% 22.03%
1937 2.77% 0.00%
1939 54.21% 0.00%
1941 14.29% 0.00%
1943 0.52% 4.88%
1945 0.00% 29.96%
1947 0.00% 2.36%
1949 0.10% 0.31%
1951 0.08% 16.86%
1953 6.20% 8.03%
1955 6.34% 11.77%
1957 31.64% 0.00%
1959 19.47% 0.00%
1961 0.00% 5.14%
1963 0.00% 53.13%
1965 22.40% 2.34%
1967 0.00% 22.19%
1969 0.00% 0.00%
1971 27.86% 14.63%
1973 2.68% 0.00%
1975 0.00% 0.00%
1977 21.54% 0.00%
1979 18.61% 0.00%
1981 11.51% 0.13%
1983 0.00% 58.55%
1985 0.00% 32.93%
1987 6.95% 1.97%
1989 0.30% 57.43%
1991 5.67% 0.00%
1993 0.00% 0.00%
1995 5.61% 0.00%
1997 11.00% 3.24%
1999 16.76% 0.00%
2001 28.25% 0.00%
2003 8.89% 0.00%
2005 2.07% 0.00%
2007 9.62% 0.00%
2009 0.00% 30.96%
2011 22.06% 2.49%
2013 2.05% 7.66%