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 Wet: Very Dry:
1895 16.24% 11.56%
1896 23.62% 8.37%
1897 10.67% 4.52%
1898 7.61% 5.26%
1899 12.52% 6.33%
1900 13.22% 13.16%
1901 2.28% 21.15%
1902 22.27% 14.59%
1903 16.66% 14.70%
1904 9.46% 3.85%
1905 24.37% 9.93%
1906 19.67% 7.88%
1907 14.65% 6.44%
1908 9.16% 1.40%
1909 13.06% 7.17%
1910 6.47% 11.51%
1911 17.95% 10.95%
1912 18.97% 2.44%
1913 19.12% 9.48%
1914 13.02% 11.45%
1915 31.60% 4.05%
1916 21.13% 15.24%
1917 4.74% 19.63%
1918 5.62% 11.34%
1919 18.20% 15.33%
1920 2.90% 3.35%
1921 12.58% 10.07%
1922 9.72% 8.51%
1923 11.41% 4.71%
1924 4.73% 18.85%
1925 10.13% 8.07%
1926 8.14% 3.89%
1927 4.96% 1.59%
1928 12.34% 4.67%
1929 7.64% 16.67%
1930 7.13% 35.36%
1931 6.85% 15.04%
1932 8.83% 4.58%
1933 7.83% 13.07%
1934 1.23% 27.67%
1935 7.07% 11.13%
1936 14.56% 26.91%
1937 12.09% 6.77%
1938 18.75% 2.62%
1939 2.32% 12.09%
1940 5.97% 22.94%
1941 11.53% 2.57%
1942 4.16% 13.00%
1943 4.03% 9.96%
1944 5.19% 22.05%
1945 11.43% 6.49%
1946 10.06% 8.63%
1947 4.49% 29.27%
1948 15.07% 8.90%
1949 7.90% 3.62%
1950 25.65% 2.11%
1951 7.16% 6.97%
1952 8.07% 15.43%
1953 8.34% 15.64%
1954 1.82% 23.94%
1955 14.68% 6.23%
1956 5.74% 4.43%
1957 3.95% 12.46%
1958 29.82% 5.97%
1959 9.70% 15.24%
1960 11.01% 18.85%
1961 8.73% 1.58%
1962 16.79% 13.20%
1963 3.58% 17.34%
1964 5.07% 11.63%
1965 9.29% 7.37%
1966 3.40% 7.91%
1967 8.44% 11.81%
1968 8.96% 7.34%
1969 12.72% 1.00%
1970 5.01% 11.04%
1971 7.83% 5.96%
1972 10.67% 15.24%
1973 10.98% 9.14%
1974 6.84% 15.70%
1975 18.85% 10.98%
1976 12.78% 7.68%
1977 7.91% 7.72%
1978 14.32% 10.14%
1979 14.50% 5.94%
1980 3.48% 26.59%
1981 11.46% 4.33%
1982 12.30% 3.60%
1983 13.26% 30.70%
1984 19.56% 8.78%
1985 7.94% 5.44%
1986 11.85% 9.21%
1987 21.74% 12.01%
1988 6.90% 11.61%
1989 7.33% 9.59%
1990 13.97% 3.14%
1991 11.20% 6.61%
1992 27.10% 2.92%
1993 29.81% 30.19%
1994 11.10% 8.36%
1995 9.93% 10.88%
1996 14.01% 4.21%
1997 13.26% 8.20%
1998 14.94% 8.27%
1999 16.26% 12.12%
2000 2.25% 25.38%
2001 11.51% 6.97%
2002 6.43% 12.04%
2003 9.94% 25.59%