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.

Move mouse towards an axis until highlighted. Left-click mouse to pan. Shift key + left-click to zoom.

Download: xml csv json
July Very Warm: Very Cold:
1895 0.00% 50.54%
1896 9.55% 6.99%
1897 7.27% 21.32%
1898 5.84% 1.67%
1899 0.69% 7.09%
1900 3.81% 7.19%
1901 50.96% 4.17%
1902 5.56% 42.18%
1903 0.71% 38.83%
1904 0.00% 51.92%
1905 0.40% 44.65%
1906 11.29% 34.70%
1907 0.78% 22.61%
1908 4.73% 15.08%
1909 4.71% 26.48%
1910 2.92% 1.33%
1911 3.72% 29.26%
1912 1.17% 32.27%
1913 4.35% 33.37%
1914 7.99% 14.06%
1915 0.99% 51.61%
1916 20.89% 15.51%
1917 12.51% 0.84%
1918 1.17% 24.44%
1919 6.11% 7.84%
1920 2.09% 17.26%
1921 20.49% 6.77%
1922 0.93% 14.93%
1923 2.18% 8.41%
1924 0.00% 38.70%
1925 13.86% 7.84%
1926 1.67% 11.18%
1927 0.48% 15.66%
1928 0.09% 5.15%
1929 1.20% 2.19%
1930 19.28% 0.73%
1931 39.15% 0.73%
1932 12.23% 8.95%
1933 21.55% 0.50%
1934 50.65% 0.45%
1935 24.91% 3.00%
1936 44.09% 3.27%
1937 1.76% 0.45%
1938 3.97% 10.54%
1939 6.48% 0.38%
1940 3.27% 3.78%
1941 4.52% 9.85%
1942 8.61% 1.80%
1943 1.64% 0.09%
1944 0.00% 15.15%
1945 0.00% 10.49%
1946 0.10% 1.59%
1947 3.03% 27.37%
1948 2.03% 10.44%
1949 13.17% 0.52%
1950 0.00% 62.64%
1951 10.79% 4.37%
1952 18.65% 2.91%
1953 5.17% 0.00%
1954 36.53% 4.61%
1955 25.64% 19.54%
1956 2.88% 14.81%
1957 6.03% 0.81%
1958 5.94% 27.42%
1959 12.73% 9.44%
1960 19.37% 11.72%
1961 2.71% 15.17%
1962 3.70% 39.76%
1963 7.97% 16.06%
1964 9.11% 3.50%
1965 0.00% 17.92%
1966 20.87% 3.25%
1967 0.54% 35.77%
1968 1.99% 11.69%
1969 14.56% 1.31%
1970 0.98% 1.42%
1971 2.51% 29.87%
1972 3.83% 32.32%
1973 0.76% 4.94%
1974 5.30% 3.10%
1975 7.99% 15.17%
1976 0.00% 22.56%
1977 4.23% 0.00%
1978 7.70% 3.51%
1979 1.10% 6.12%
1980 38.91% 0.00%
1981 5.56% 0.88%
1982 0.00% 6.80%
1983 11.27% 18.44%
1984 3.52% 12.82%
1985 12.27% 0.36%
1986 14.92% 30.17%
1987 7.06% 24.04%
1988 23.52% 0.00%
1989 16.08% 6.85%
1990 4.23% 10.46%
1991 3.08% 5.10%
1992 3.18% 45.99%
1993 17.11% 38.59%
1994 23.70% 15.77%
1995 5.94% 8.57%
1996 21.91% 18.01%
1997 0.95% 4.19%
1998 36.83% 0.00%
1999 18.76% 4.47%
2000 16.40% 11.70%
2001 16.90% 7.48%
2002 42.12% 1.17%
2003 39.18% 0.00%
2004 5.37% 15.99%
2005 34.02% 0.00%
2006 49.95% 0.00%
2007 32.28% 13.38%
2008 7.44% 1.45%