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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April Very Wet: Very Dry:
1895 3.64% 18.92%
1896 18.92% 14.81%
1897 6.02% 4.87%
1899 1.16% 22.63%
1901 11.33% 5.35%
1903 3.85% 11.70%
1905 21.27% 6.91%
1907 2.88% 3.99%
1909 5.67% 21.03%
1911 12.07% 7.71%
1913 3.75% 8.34%
1915 24.83% 24.08%
1917 11.81% 3.07%
1919 9.37% 5.17%
1921 7.22% 3.69%
1923 12.21% 2.54%
1925 6.41% 15.43%
1927 19.03% 8.76%
1929 12.51% 4.40%
1931 11.71% 10.16%
1933 7.15% 6.17%
1935 15.07% 5.96%
1937 14.41% 10.26%
1939 2.98% 11.46%
1941 34.52% 6.07%
1943 3.95% 5.68%
1945 12.27% 0.98%
1947 14.27% 5.92%
1949 5.13% 26.94%
1951 7.44% 3.37%
1953 7.01% 0.00%
1955 6.67% 9.59%
1957 25.56% 0.94%
1959 1.77% 12.02%
1961 6.51% 15.44%
1963 15.27% 15.46%
1965 17.47% 8.48%
1967 14.09% 10.02%
1969 6.07% 4.95%
1971 4.77% 15.04%
1973 21.48% 4.57%
1975 8.96% 3.55%
1977 11.12% 28.74%
1979 11.44% 5.78%
1981 8.51% 11.77%
1983 17.86% 8.39%
1985 8.47% 22.66%
1987 4.64% 40.45%
1989 5.27% 32.07%
1991 18.60% 12.55%
1993 13.23% 7.79%
1995 9.39% 4.75%
1997 16.87% 9.50%
1999 31.13% 5.91%
2001 8.08% 16.90%
2003 11.80% 9.58%
2005 8.40% 7.73%
2007 6.08% 1.57%
2009 11.48% 0.96%
2011 25.65% 10.07%
2013 12.08% 6.45%