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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July Very Wet: Very Dry:
1895 16.24% 11.56%
1896 23.62% 8.37%
1897 10.67% 4.52%
1899 12.52% 6.33%
1901 2.28% 21.15%
1903 16.66% 14.70%
1905 24.37% 9.93%
1907 14.65% 6.44%
1909 13.06% 7.17%
1911 17.95% 10.95%
1913 19.12% 9.48%
1915 31.60% 4.05%
1917 4.74% 19.63%
1919 18.20% 15.33%
1921 12.58% 10.07%
1923 11.41% 4.71%
1925 10.13% 8.07%
1927 4.96% 1.59%
1929 7.64% 16.67%
1931 6.85% 15.04%
1933 7.83% 13.07%
1935 7.07% 11.13%
1937 12.09% 6.77%
1939 2.32% 12.09%
1941 11.53% 2.57%
1943 4.03% 9.96%
1945 11.43% 6.49%
1947 4.49% 29.27%
1949 7.90% 3.62%
1951 7.16% 6.97%
1953 8.34% 15.64%
1955 14.68% 6.23%
1957 3.95% 12.46%
1959 9.70% 15.24%
1961 8.73% 1.58%
1963 3.58% 17.34%
1965 9.29% 7.37%
1967 8.44% 11.81%
1969 12.72% 1.00%
1971 7.83% 5.96%
1973 10.98% 9.14%
1975 18.85% 10.98%
1977 7.91% 7.72%
1979 14.50% 5.94%
1981 11.46% 4.33%
1983 13.26% 30.70%
1985 7.94% 5.44%
1987 21.74% 12.01%
1989 7.33% 9.59%
1991 11.20% 6.61%
1993 29.81% 30.19%
1995 9.93% 10.88%
1997 13.26% 8.20%
1999 16.26% 12.12%
2001 11.51% 6.97%
2003 9.94% 25.59%
2005 4.61% 13.51%
2007 10.80% 5.16%
2009 12.75% 4.98%
2011 7.01% 10.95%
2013 20.43% 5.27%