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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July Very Warm: Very Cold:
1895 0.00% 50.54%
1896 9.55% 6.99%
1897 7.27% 21.32%
1898 5.84% 1.67%
1899 0.69% 7.09%
1900 3.81% 7.19%
1901 50.96% 4.17%
1902 5.56% 42.18%
1903 0.71% 38.83%
1904 0.00% 51.92%
1905 0.40% 44.65%
1906 11.29% 34.70%
1907 0.78% 22.61%
1908 4.73% 15.08%
1909 4.71% 26.48%
1910 2.92% 1.33%
1911 3.72% 29.26%
1912 1.17% 32.27%
1913 4.35% 33.37%
1914 7.99% 14.06%
1915 0.99% 51.61%
1916 20.89% 15.51%
1917 12.51% 0.84%
1918 1.17% 24.44%
1919 6.11% 7.84%
1920 2.09% 17.26%
1921 20.49% 6.77%
1922 0.93% 14.93%
1923 2.18% 8.41%
1924 0.00% 38.70%
1925 13.86% 7.84%
1926 1.67% 11.18%
1927 0.48% 15.66%
1928 0.09% 5.15%
1929 1.20% 2.19%
1930 19.28% 0.73%
1931 39.15% 0.73%
1932 12.23% 8.95%
1933 21.55% 0.50%
1934 50.65% 0.45%
1935 24.91% 3.00%
1936 44.09% 3.27%
1937 1.76% 0.45%
1938 3.97% 10.54%
1939 6.48% 0.38%
1940 3.27% 3.78%
1941 4.52% 9.85%
1942 8.61% 1.80%
1943 1.64% 0.09%
1944 0.00% 15.15%
1945 0.00% 10.49%
1946 0.10% 1.59%
1947 3.03% 27.37%
1948 2.03% 10.44%
1949 13.17% 0.52%
1950 0.00% 62.64%
1951 10.79% 4.37%
1952 18.65% 2.91%
1953 5.17% 0.00%
1954 36.53% 4.61%
1955 25.64% 19.54%
1956 2.88% 14.81%
1957 6.03% 0.81%
1958 5.94% 27.42%
1959 12.73% 9.44%