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 Warm: Very Cold:
1895 5.57% 15.48%
1896 19.85% 0.25%
1897 7.75% 9.18%
1898 7.30% 0.00%
1899 6.60% 2.16%
1900 21.71% 0.00%
1901 8.40% 14.53%
1902 14.55% 23.67%
1903 3.25% 55.38%
1904 0.00% 14.63%
1905 2.11% 4.46%
1906 3.46% 16.92%
1907 0.00% 46.93%
1908 0.28% 21.48%
1909 0.00% 0.35%
1910 2.06% 20.86%
1911 39.93% 1.83%
1912 0.00% 34.01%
1913 0.00% 17.15%
1914 24.02% 3.60%
1915 4.17% 41.58%
1916 3.90% 37.99%
1917 0.00% 19.02%
1918 51.38% 5.44%
1919 20.41% 16.22%
1920 0.00% 6.29%
1921 27.30% 4.13%
1922 8.81% 0.00%
1923 5.78% 17.07%
1924 11.84% 16.33%
1925 26.63% 0.58%
1926 12.79% 20.54%
1927 1.45% 18.93%
1928 0.00% 46.33%
1929 0.00% 4.77%
1930 2.94% 2.91%
1931 27.41% 0.00%
1932 1.40% 0.61%
1933 43.36% 1.55%
1934 39.50% 3.98%
1935 0.00% 19.84%
1936 29.88% 1.10%
1937 1.42% 0.08%
1938 1.85% 1.10%
1939 7.31% 4.33%
1940 24.23% 7.80%
1941 0.33% 15.58%
1942 0.23% 5.73%
1943 24.45% 18.63%
1944 18.28% 17.72%
1945 0.83% 47.52%
1946 1.66% 3.70%
1947 0.10% 24.39%
1948 5.69% 1.67%
1949 9.89% 0.00%
1950 1.09% 0.00%
1951 0.00% 32.53%
1952 43.24% 7.28%
1953 34.13% 12.12%
1954 5.22% 10.95%
1955 0.00% 31.45%
1956 33.09% 1.27%
1957 4.99% 0.00%
1958 7.99% 22.34%
1959 13.84% 1.18%
1960 14.50% 0.00%
1961 32.18% 17.86%
1962 0.00% 0.23%
1963 2.34% 8.83%
1964 0.00% 0.91%
1965 0.00% 20.18%
1966 0.00% 11.32%
1967 5.25% 18.82%
1968 0.00% 2.60%
1969 3.63% 29.12%
1970 8.20% 2.26%
1971 8.12% 3.39%
1972 0.00% 18.65%
1973 3.30% 4.37%
1974 20.09% 27.24%
1975 0.00% 7.36%
1976 4.95% 20.72%
1977 27.47% 5.03%
1978 1.77% 0.00%
1979 0.00% 15.16%
1980 13.46% 14.98%
1981 24.83% 2.55%
1982 1.61% 40.17%
1983 0.21% 23.84%
1984 1.25% 0.85%
1985 10.45% 14.87%
1986 27.22% 2.18%
1987 15.00% 3.09%
1988 31.51% 1.45%
1989 0.82% 11.87%
1990 24.18% 0.00%
1991 10.06% 8.11%
1992 7.74% 30.04%
1993 0.36% 9.25%
1994 30.58% 0.00%
1995 7.09% 21.33%
1996 12.78% 0.00%
1997 2.86% 12.48%
1998 21.34% 19.71%
1999 4.35% 0.21%
2000 13.75% 1.27%
2001 13.82% 0.47%
2002 23.70% 0.59%
2003 8.94% 16.36%
2004 3.37% 6.98%