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%
1961 19.78% 11.40%
1962 7.76% 0.09%
1963 0.00% 10.57%
1964 1.55% 25.42%
1965 0.00% 10.24%
1966 1.51% 24.81%
1967 17.29% 42.76%
1968 2.01% 34.89%
1969 28.18% 7.64%
1970 15.41% 0.00%
1971 22.62% 18.90%
1972 0.00% 6.77%
1973 7.75% 6.67%
1974 0.00% 32.09%
1975 2.25% 19.84%
1976 1.92% 35.99%
1977 9.70% 17.64%
1978 1.60% 3.12%
1979 0.00% 13.71%
1980 28.64% 11.98%
1981 13.71% 6.68%
1982 3.47% 11.09%
1983 57.24% 2.61%
1984 11.23% 1.76%
1985 0.00% 17.36%
1986 17.45% 16.27%
1987 11.75% 11.43%
1988 19.12% 0.00%
1989 0.75% 3.09%
1990 3.98% 5.94%
1991 13.05% 2.14%
1992 5.82% 57.94%
1993 4.02% 15.46%
1994 23.77% 14.24%
1995 48.52% 1.57%
1996 13.12% 5.49%
1997 6.55% 5.02%
1998 33.70% 0.00%
1999 15.29% 0.00%
2000 39.43% 0.00%
2001 33.33% 0.00%
2002 16.41% 2.09%
2003 41.78% 0.00%
2004 5.04% 48.45%
2005 22.96% 0.00%
2006 22.70% 0.00%
2007 47.74% 0.00%
2008 10.35% 0.10%
2009 9.64% 6.53%
2010 38.70% 0.00%