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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August Very Warm: Very Cold:
1895 1.90% 3.59%
1896 9.51% 3.19%
1897 6.32% 16.46%
1899 18.14% 27.88%
1901 8.78% 1.37%
1903 5.00% 19.00%
1905 3.60% 4.38%
1907 0.48% 30.49%
1909 10.65% 4.17%
1911 3.56% 27.45%
1913 15.95% 2.30%
1915 11.05% 48.02%
1917 0.00% 22.56%
1919 2.93% 3.16%
1921 1.89% 7.70%
1923 0.72% 26.46%
1925 0.82% 17.99%
1927 2.28% 54.23%
1929 15.67% 10.71%
1931 4.34% 10.52%
1933 0.00% 0.55%
1935 1.89% 0.00%
1937 48.94% 1.30%
1939 6.27% 2.93%
1941 3.76% 10.24%
1943 30.17% 2.04%
1945 2.11% 0.25%
1947 38.28% 4.00%
1949 2.21% 4.61%
1951 17.41% 10.44%
1953 0.00% 3.71%
1955 27.36% 2.04%
1957 0.00% 9.60%
1959 20.67% 2.17%
1961 19.78% 11.40%
1963 0.00% 10.57%
1965 0.00% 10.24%
1967 17.29% 42.76%
1969 28.18% 7.64%
1971 22.62% 18.90%
1973 7.75% 6.67%
1975 2.25% 19.84%
1977 9.70% 17.64%
1979 0.00% 13.71%
1981 13.71% 6.68%
1983 57.24% 2.61%
1985 0.00% 17.36%
1987 11.75% 11.43%
1989 0.75% 3.09%
1991 13.05% 2.14%
1993 4.02% 15.46%
1995 48.52% 1.57%
1997 6.55% 5.02%
1999 15.29% 0.00%
2001 33.33% 0.00%
2003 41.78% 0.00%
2005 22.96% 0.00%
2007 47.74% 0.00%
2009 9.64% 6.53%
2011 45.71% 0.00%
2013 13.78% 0.62%