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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June Very Wet: Very Dry:
1895 6.21% 15.75%
1896 3.04% 14.70%
1897 3.69% 6.95%
1898 8.85% 4.48%
1899 13.53% 6.89%
1900 12.40% 21.37%
1901 8.71% 19.13%
1902 10.37% 20.45%
1903 14.46% 9.00%
1904 11.36% 14.31%
1905 12.96% 7.16%
1906 8.72% 9.32%
1907 15.27% 4.97%
1908 11.33% 9.08%
1909 9.16% 3.77%
1910 9.39% 27.54%
1911 2.88% 18.52%
1912 6.84% 16.75%
1913 22.33% 10.50%
1914 15.76% 10.28%
1915 10.62% 12.61%
1916 9.75% 23.39%
1917 5.97% 33.13%
1918 6.04% 18.19%
1919 6.56% 26.88%
1920 5.95% 3.35%
1921 13.52% 10.84%
1922 5.56% 12.88%
1923 15.18% 7.86%
1924 7.42% 24.56%
1925 15.20% 7.17%
1926 1.51% 9.25%
1927 11.78% 3.44%
1928 24.88% 8.98%
1929 5.87% 15.55%
1930 2.21% 17.52%
1931 7.00% 19.20%
1932 9.25% 5.50%
1933 2.82% 48.53%
1934 7.05% 8.30%
1935 10.86% 22.80%
1936 5.30% 32.90%
1937 9.25% 3.26%
1938 10.36% 3.02%
1939 9.23% 7.94%
1940 11.03% 11.69%
1941 19.64% 2.74%
1942 10.65% 10.34%
1943 13.15% 1.21%
1944 18.92% 10.07%
1945 14.37% 9.73%
1946 4.77% 17.18%
1947 24.21% 4.77%
1948 17.19% 2.60%
1949 12.93% 11.03%
1950 5.66% 10.99%
1951 14.33% 14.73%
1952 6.87% 25.40%
1953 6.01% 16.14%
1954 6.23% 16.36%
1955 2.74% 6.87%
1956 0.68% 19.21%
1957 15.30% 3.07%
1958 10.21% 2.39%
1959 4.22% 8.51%
1960 4.67% 15.99%
1961 11.32% 17.26%
1962 10.63% 4.11%
1963 15.02% 9.34%
1964 15.94% 9.29%
1965 16.05% 6.78%
1966 3.52% 15.69%
1967 31.71% 5.16%
1968 13.89% 8.53%
1969 23.07% 5.72%
1970 6.51% 4.64%
1971 2.21% 15.24%
1972 18.63% 4.36%
1973 10.20% 12.64%
1974 5.65% 24.23%
1975 6.31% 4.76%
1976 5.00% 7.98%
1977 3.01% 6.76%
1978 2.07% 9.97%
1979 1.63% 16.03%
1980 0.47% 15.76%
1981 15.09% 7.49%
1982 9.19% 3.90%
1983 5.58% 6.03%
1984 15.45% 6.46%
1985 2.18% 7.18%
1986 14.20% 9.29%
1987 7.35% 9.87%