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 Wet: Very Dry:
1895 6.32% 7.87%
1896 5.61% 19.08%
1897 4.08% 8.52%
1898 11.86% 4.50%
1899 7.94% 17.89%
1900 9.34% 19.79%
1901 18.90% 8.96%
1902 6.21% 18.55%
1903 12.45% 5.05%
1904 6.52% 1.18%
1905 3.27% 8.34%
1906 26.52% 3.74%
1907 7.16% 7.13%
1908 8.22% 5.13%
1909 12.93% 15.08%
1910 2.42% 22.25%
1911 11.62% 11.43%
1912 17.25% 4.90%
1913 2.68% 16.57%
1914 15.48% 13.27%
1915 22.10% 11.21%
1916 9.81% 4.28%
1917 6.33% 11.03%
1918 3.15% 2.38%
1919 8.61% 16.61%
1920 22.09% 3.19%
1921 9.97% 11.12%
1922 9.67% 12.70%
1923 16.48% 4.87%
1924 4.29% 26.78%
1925 4.57% 18.79%
1926 19.46% 7.68%
1927 11.46% 7.62%
1928 12.89% 9.68%
1929 4.15% 28.52%
1930 10.55% 20.84%
1931 12.12% 10.14%
1932 7.95% 5.54%
1933 15.51% 7.01%
1934 2.61% 13.65%
1935 5.86% 6.50%
1936 2.77% 17.13%
1937 5.78% 15.35%
1938 1.13% 19.05%
1939 6.77% 6.43%
1940 12.00% 16.67%
1941 15.72% 3.65%
1942 18.03% 3.69%
1943 3.86% 23.03%
1944 14.45% 22.23%
1945 12.84% 4.51%
1946 6.53% 5.43%
1947 10.63% 13.49%
1948 2.14% 11.17%
1949 6.80% 10.19%
1950 9.30% 19.38%
1951 15.44% 13.08%
1952 5.02% 10.34%
1953 7.19% 16.19%
1954 11.65% 10.94%
1955 15.82% 22.95%
1956 4.01% 21.58%
1957 8.75% 20.50%
1958 1.85% 4.62%
1959 6.86% 1.72%
1960 11.43% 14.36%
1961 8.13% 4.66%
1962 2.51% 23.53%
1963 10.48% 6.21%
1964 7.87% 5.42%
1965 16.58% 1.26%
1966 16.16% 2.08%
1967 7.84% 17.23%
1968 25.39% 5.83%
1969 3.25% 25.29%
1970 5.56% 19.78%
1971 12.76% 10.35%
1972 12.50% 6.08%
1973 0.55% 13.43%
1974 24.01% 8.33%
1975 18.43% 9.83%
1976 14.38% 23.14%
1977 25.78% 0.18%
1978 9.82% 5.78%
1979 14.95% 1.78%
1980 16.39% 19.65%
1981 10.59% 6.86%
1982 6.60% 5.46%
1983 20.60% 13.43%
1984 14.82% 8.69%
1985 15.33% 18.19%
1986 5.93% 3.64%
1987 8.71% 6.93%
1988 10.77% 6.03%
1989 8.03% 3.68%
1990 9.95% 5.92%
1991 7.02% 3.25%
1992 12.62% 1.09%
1993 12.68% 7.26%
1994 5.50% 12.65%
1995 8.52% 8.04%
1996 13.45% 17.12%
1997 13.29% 6.98%
1998 4.73% 6.55%
1999 10.75% 13.23%
2000 2.00% 25.28%