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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November Very Warm: Very Cold:
1895 0.00% 22.39%
1896 11.86% 37.57%
1897 1.11% 9.25%
1898 0.00% 32.42%
1899 35.87% 0.25%
1900 2.54% 6.16%
1901 14.16% 22.40%
1902 32.37% 0.88%
1903 3.75% 17.86%
1904 21.15% 8.03%
1905 0.35% 2.20%
1906 0.00% 4.65%
1907 0.00% 5.84%
1908 0.72% 0.00%
1909 40.89% 0.00%
1910 10.91% 21.92%
1911 0.00% 55.08%
1912 1.65% 1.35%
1913 39.32% 0.00%
1914 17.46% 1.56%
1915 8.01% 0.00%
1916 0.00% 19.00%
1917 32.46% 15.62%
1918 0.56% 6.79%
1919 2.37% 24.79%
1920 0.00% 7.80%
1921 19.03% 9.88%
1922 6.36% 10.58%
1923 10.42% 1.63%
1924 5.40% 0.00%
1925 0.00% 1.88%
1926 12.56% 27.49%
1927 42.65% 4.13%
1928 0.00% 0.00%
1929 0.90% 40.23%
1930 0.00% 8.24%
1931 44.11% 21.91%
1932 9.02% 23.44%
1933 4.63% 9.53%
1934 24.38% 0.00%
1935 0.00% 21.88%
1936 0.00% 16.44%
1937 2.25% 8.58%
1938 0.00% 25.10%
1939 13.16% 7.86%
1940 0.00% 14.71%
1941 0.91% 0.00%
1942 11.18% 0.00%
1943 0.00% 2.43%
1944 2.59% 4.10%
1945 4.61% 0.54%
1946 15.84% 10.57%
1947 0.09% 45.56%
1948 13.59% 11.81%
1949 53.78% 2.23%
1950 14.65% 25.10%
1951 0.00% 45.55%
1952 0.00% 29.82%
1953 26.67% 0.00%
1954 37.52% 3.02%
1955 0.00% 29.19%
1956 0.00% 9.08%
1957 0.59% 24.33%
1958 1.86% 0.00%
1959 1.36% 38.53%
1960 0.10% 0.00%
1961 1.28% 10.37%
1962 21.60% 4.21%
1963 13.19% 0.00%
1964 4.45% 9.25%
1965 41.46% 0.59%
1966 20.09% 0.00%
1967 11.17% 15.28%
1968 0.00% 1.92%
1969 0.00% 0.95%
1970 0.00% 5.52%
1971 0.00% 0.86%
1972 0.00% 36.57%
1973 21.23% 2.11%
1974 0.00% 0.00%
1975 15.00% 0.71%
1976 5.59% 52.15%
1977 0.46% 0.00%
1978 12.98% 12.65%
1979 5.45% 19.42%
1980 4.47% 3.72%
1981 30.49% 0.00%
1982 1.61% 4.17%
1983 0.00% 0.00%
1984 0.00% 0.90%
1985 27.46% 41.10%
1986 8.53% 4.50%
1987 18.13% 0.00%
1988 3.90% 0.00%
1989 1.27% 0.23%
1990 31.85% 0.00%
1991 0.29% 19.92%
1992 0.45% 18.71%
1993 0.00% 26.45%
1994 37.80% 22.45%
1995 30.87% 24.27%
1996 0.00% 35.92%
1997 1.61% 2.34%
1998 38.38% 0.00%
1999 88.02% 0.00%
2000 0.00% 53.35%
2001 77.60% 0.00%
2002 3.05% 0.00%
2003 29.72% 5.56%
2004 26.17% 0.00%
2005 32.34% 0.00%
2006 18.04% 0.00%
2007 17.02% 0.00%