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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August Very Warm: Very Cold:
1895 1.90% 3.59%
1896 9.51% 3.19%
1897 6.32% 16.46%
1898 16.38% 2.54%
1899 18.14% 27.88%
1900 31.68% 24.16%
1901 8.78% 1.37%
1902 8.51% 18.89%
1903 5.00% 19.00%
1904 0.00% 22.65%
1905 3.60% 4.38%
1906 8.44% 16.57%
1907 0.48% 30.49%
1908 0.00% 23.48%
1909 10.65% 4.17%
1910 4.77% 24.74%
1911 3.56% 27.45%
1912 1.88% 46.44%
1913 15.95% 2.30%
1914 0.10% 6.69%
1915 11.05% 48.02%
1916 1.32% 18.03%
1917 0.00% 22.56%
1918 21.78% 18.88%
1919 2.93% 3.16%
1920 0.36% 32.68%
1921 1.89% 7.70%
1922 8.20% 8.72%
1923 0.72% 26.46%
1924 15.59% 7.56%
1925 0.82% 17.99%
1926 4.52% 0.00%
1927 2.28% 54.23%
1928 3.89% 11.70%
1929 15.67% 10.71%
1930 3.10% 2.99%
1931 4.34% 10.52%
1932 0.00% 0.55%
1933 0.00% 0.55%
1934 31.13% 6.69%
1935 1.89% 0.00%
1936 34.43% 0.10%
1937 48.94% 1.30%
1938 29.18% 0.54%
1939 6.27% 2.93%
1940 6.16% 4.73%
1941 3.76% 10.24%
1942 1.54% 0.00%
1943 30.17% 2.04%
1944 3.92% 0.44%
1945 2.11% 0.25%
1946 0.00% 22.26%
1947 38.28% 4.00%
1948 0.00% 5.25%
1949 2.21% 4.61%
1950 0.00% 48.25%
1951 17.41% 10.44%
1952 14.56% 0.00%
1953 0.00% 3.71%
1954 22.16% 19.62%
1955 27.36% 2.04%
1956 3.04% 14.95%
1957 0.00% 9.60%
1958 27.09% 0.00%
1959 20.67% 2.17%
1960 2.24% 3.02%