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 climate division data set. 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%
1898 4.12% 0.83%
1899 2.73% 4.24%
1900 29.29% 17.80%
1901 0.00% 23.70%
1902 0.10% 21.93%
1903 0.00% 22.50%
1904 1.82% 2.80%
1905 6.17% 0.00%
1906 29.35% 2.37%
1907 1.12% 9.39%
1908 17.18% 6.00%
1909 0.00% 6.50%
1910 17.63% 4.23%
1911 36.70% 12.21%
1912 8.41% 43.43%
1913 0.35% 21.72%
1914 0.50% 10.42%
1915 3.89% 6.44%
1916 0.00% 7.38%
1917 0.00% 13.41%
1918 1.58% 59.05%
1919 1.33% 1.51%
1920 7.80% 7.30%
1921 46.09% 12.19%
1922 15.72% 1.10%
1923 0.00% 9.84%
1924 0.00% 30.65%
1925 36.30% 12.54%
1926 19.92% 25.54%
1927 7.53% 11.40%
1928 0.00% 25.41%
1929 0.00% 20.82%
1930 17.08% 6.62%
1931 61.93% 1.81%
1932 1.83% 5.88%
1933 61.55% 5.06%
1934 3.81% 14.49%
1935 2.43% 9.82%
1936 26.69% 0.00%