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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May Very Wet: Very Dry:
1895 7.89% 7.46%
1896 21.17% 18.95%
1897 3.18% 24.02%
1898 24.37% 9.18%
1899 5.36% 18.31%
1900 8.91% 14.57%
1901 11.28% 15.18%
1902 9.54% 3.32%
1903 12.12% 13.40%
1904 2.56% 5.84%
1905 16.52% 2.81%
1906 21.49% 3.92%
1907 14.66% 5.26%
1908 24.72% 0.00%
1909 4.37% 11.03%
1910 2.35% 17.13%
1911 5.01% 31.41%
1912 10.69% 5.28%
1913 3.41% 16.44%
1914 11.62% 16.74%
1915 28.24% 3.36%
1916 2.74% 9.69%
1917 14.75% 12.23%
1918 4.65% 11.74%
1919 7.27% 8.62%
1920 3.91% 15.08%
1921 9.51% 11.70%
1922 7.76% 2.01%
1923 11.84% 8.77%
1924 3.11% 28.97%
1925 2.40% 26.49%
1926 5.12% 12.60%
1927 16.22% 20.45%
1928 11.89% 21.23%
1929 17.86% 14.02%
1930 16.72% 8.18%
1931 1.51% 12.30%
1932 3.40% 13.60%
1933 12.34% 2.53%
1934 3.80% 41.96%
1935 24.13% 7.66%
1936 6.84% 27.14%
1937 3.22% 15.51%
1938 10.59% 4.76%