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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May Very Wet: Very Dry:
1895 7.89% 7.46%
1896 21.17% 18.95%
1897 3.18% 24.02%
1899 5.36% 18.31%
1901 11.28% 15.18%
1903 12.12% 13.40%
1905 16.52% 2.81%
1907 14.66% 5.26%
1909 4.37% 11.03%
1911 5.01% 31.41%
1913 3.41% 16.44%
1915 28.24% 3.36%
1917 14.75% 12.23%
1919 7.27% 8.62%
1921 9.51% 11.70%
1923 11.84% 8.77%
1925 2.40% 26.49%
1927 16.22% 20.45%
1929 17.86% 14.02%
1931 1.51% 12.30%
1933 12.34% 2.53%
1935 24.13% 7.66%
1937 3.22% 15.51%
1939 0.42% 18.74%
1941 16.71% 20.65%
1943 9.23% 5.54%
1945 11.70% 18.29%
1947 11.78% 6.20%
1949 9.01% 3.91%
1951 4.27% 13.10%
1953 16.39% 6.83%
1955 5.86% 4.74%
1957 43.26% 1.07%
1959 9.87% 4.85%
1961 7.20% 7.65%
1963 2.30% 18.51%
1965 13.90% 14.69%
1967 5.32% 6.88%
1969 5.89% 10.29%
1971 10.72% 4.14%
1973 8.65% 6.45%
1975 8.31% 4.98%
1977 17.18% 15.44%
1979 14.64% 1.07%
1981 20.10% 2.27%
1983 13.97% 3.20%
1985 2.06% 5.74%
1987 18.41% 3.48%
1989 10.98% 4.71%
1991 19.11% 5.42%
1993 6.64% 6.29%
1995 34.15% 0.73%
1997 1.77% 5.16%
1999 6.98% 4.48%
2001 8.08% 15.59%
2003 14.64% 5.45%
2005 16.31% 11.12%
2007 16.45% 23.62%
2009 15.17% 6.24%
2011 26.39% 15.54%
2013 13.34% 5.70%