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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September Very Warm: Very Cold:
1895 27.38% 12.02%
1896 0.11% 27.68%
1897 26.83% 6.28%
1899 2.73% 4.24%
1901 0.00% 23.70%
1903 0.00% 22.50%
1905 6.17% 0.00%
1907 1.12% 9.39%
1909 0.00% 6.50%
1911 36.70% 12.21%
1913 0.35% 21.72%
1915 3.89% 6.44%
1917 0.00% 13.41%
1919 1.33% 1.51%
1921 46.09% 12.19%
1923 0.00% 9.84%
1925 36.30% 12.54%
1927 7.53% 11.40%
1929 0.00% 20.82%
1931 61.93% 1.81%
1933 61.55% 5.06%
1935 2.43% 9.82%
1937 2.05% 2.96%
1939 33.94% 0.44%
1941 10.72% 29.13%
1943 7.98% 14.44%
1945 11.27% 0.25%
1947 16.72% 0.00%
1949 2.04% 23.00%
1951 2.04% 18.79%
1953 4.94% 0.00%
1955 1.56% 0.00%
1957 1.46% 1.93%
1959 6.60% 0.00%
1961 11.55% 39.57%
1963 28.15% 9.77%
1965 0.02% 48.59%
1967 14.97% 33.37%
1969 2.55% 0.19%
1971 8.50% 20.41%
1973 1.98% 4.65%
1975 0.90% 42.38%
1977 12.98% 0.39%
1979 25.38% 3.26%
1981 1.07% 3.61%
1983 12.24% 3.24%
1985 0.00% 38.16%
1987 3.10% 1.10%
1989 1.06% 13.14%
1991 6.75% 9.42%
1993 0.00% 25.57%
1995 7.18% 2.67%
1997 12.95% 0.00%
1999 3.64% 0.26%
2001 26.46% 3.17%
2003 15.00% 3.44%
2005 49.63% 0.00%
2007 13.44% 0.00%
2009 31.70% 0.00%
2011 31.55% 0.69%
2013 28.00% 0.00%