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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December Very Wet: Very Dry:
1895 9.29% 4.75%
1896 0.00% 33.23%
1897 3.93% 2.14%
1898 5.52% 13.06%
1899 4.53% 3.47%
1900 1.90% 22.79%
1901 15.23% 9.11%
1902 14.14% 0.00%
1903 1.88% 27.38%
1904 2.48% 4.34%
1905 8.51% 24.03%
1906 21.88% 2.01%
1907 9.60% 7.19%
1908 7.01% 20.38%
1909 18.74% 0.26%
1910 0.00% 6.45%
1911 23.17% 0.00%
1912 4.08% 14.74%
1913 18.25% 19.14%
1914 10.21% 11.60%
1915 5.99% 1.04%
1916 7.64% 6.22%
1917 10.88% 47.60%
1918 21.50% 5.70%
1919 1.89% 15.66%
1920 5.57% 5.36%
1921 14.33% 8.93%
1922 5.81% 18.11%
1923 17.54% 1.10%
1924 12.19% 0.39%
1925 5.33% 12.83%
1926 17.86% 1.05%
1927 14.10% 1.10%
1928 0.00% 13.77%
1929 7.16% 22.17%
1930 0.65% 45.52%
1931 23.79% 2.88%
1932 15.01% 4.53%
1933 13.83% 7.49%
1934 0.00% 4.08%
1935 1.84% 10.63%
1936 9.76% 0.00%
1937 7.40% 3.24%
1938 2.11% 8.34%
1939 0.50% 8.10%
1940 19.59% 4.45%
1941 10.78% 2.27%
1942 13.14% 0.62%
1943 9.08% 25.73%
1944 7.33% 13.85%
1945 9.47% 4.25%
1946 1.16% 9.60%
1947 5.43% 5.80%
1948 5.80% 3.25%