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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September Very Warm: Very Cold:
1895 27.38% 12.02%
1896 0.11% 27.68%
1897 26.83% 6.28%
1898 4.12% 0.83%
1899 2.73% 4.24%
1900 29.29% 17.80%
1901 0.00% 23.70%
1902 0.10% 21.93%
1903 0.00% 22.50%
1904 1.82% 2.80%
1905 6.17% 0.00%
1906 29.35% 2.37%
1907 1.12% 9.39%
1908 17.18% 6.00%
1909 0.00% 6.50%
1910 17.63% 4.23%
1911 36.70% 12.21%
1912 8.41% 43.43%
1913 0.35% 21.72%
1914 0.50% 10.42%
1915 3.89% 6.44%
1916 0.00% 7.38%
1917 0.00% 13.41%
1918 1.58% 59.05%
1919 1.33% 1.51%
1920 7.80% 7.30%
1921 46.09% 12.19%
1922 15.72% 1.10%
1923 0.00% 9.84%
1924 0.00% 30.65%
1925 36.30% 12.54%
1926 19.92% 25.54%
1927 7.53% 11.40%
1928 0.00% 25.41%
1929 0.00% 20.82%
1930 17.08% 6.62%
1931 61.93% 1.81%
1932 1.83% 5.88%
1933 61.55% 5.06%
1934 3.81% 14.49%
1935 2.43% 9.82%
1936 26.69% 0.00%
1937 2.05% 2.96%
1938 18.66% 3.27%
1939 33.94% 0.44%
1940 17.79% 9.74%
1941 10.72% 29.13%
1942 0.00% 14.00%
1943 7.98% 14.44%
1944 0.89% 1.20%
1945 11.27% 0.25%
1946 1.90% 0.00%
1947 16.72% 0.00%
1948 19.92% 0.98%
1949 2.04% 23.00%
1950 0.10% 7.49%
1951 2.04% 18.79%
1952 4.58% 0.00%
1953 4.94% 0.00%
1954 35.17% 0.00%
1955 1.56% 0.00%
1956 15.46% 14.10%
1957 1.46% 1.93%
1958 1.00% 0.00%
1959 6.60% 0.00%
1960 7.36% 0.10%
1961 11.55% 39.57%
1962 0.10% 10.81%
1963 28.15% 9.77%
1964 0.00% 3.22%
1965 0.02% 48.59%
1966 7.07% 7.31%
1967 14.97% 33.37%
1968 1.76% 11.41%
1969 2.55% 0.19%
1970 15.41% 22.43%
1971 8.50% 20.41%
1972 6.26% 12.02%
1973 1.98% 4.65%
1974 7.23% 46.40%
1975 0.90% 42.38%
1976 0.00% 9.03%
1977 12.98% 0.39%
1978 19.44% 9.69%
1979 25.38% 3.26%
1980 17.66% 0.00%
1981 1.07% 3.61%
1982 1.20% 0.46%
1983 12.24% 3.24%
1984 3.42% 17.39%
1985 0.00% 38.16%
1986 4.57% 35.27%
1987 3.10% 1.10%
1988 1.10% 3.67%
1989 1.06% 13.14%
1990 30.10% 0.00%
1991 6.75% 9.42%
1992 0.00% 0.00%
1993 0.00% 25.57%
1994 13.84% 1.12%
1995 7.18% 2.67%
1996 0.08% 6.83%
1997 12.95% 0.00%
1998 73.02% 0.00%
1999 3.64% 0.26%
2000 10.35% 0.00%
2001 26.46% 3.17%
2002 21.55% 0.00%
2003 15.00% 3.44%
2004 9.54% 0.00%
2005 49.63% 0.00%
2006 0.00% 22.20%
2007 13.44% 0.00%
2008 5.69% 1.92%
2009 31.70% 0.00%
2010 25.66% 0.00%
2011 31.55% 0.69%
2012 18.04% 0.00%
2013 27.90% 0.00%