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.

Download: xml csv json
May Very Warm: Very Cold:
1895 0.16% 5.71%
1896 48.64% 18.04%
1897 28.55% 3.44%
1898 6.72% 4.18%
1899 20.67% 27.82%
1900 9.22% 1.65%
1901 11.50% 0.31%
1902 29.22% 4.63%
1903 1.12% 11.56%
1904 3.13% 0.22%
1905 12.34% 28.28%
1906 0.00% 5.04%
1907 0.00% 71.28%
1908 0.00% 27.75%
1909 0.00% 17.91%
1910 3.92% 20.95%
1911 21.02% 15.97%
1912 1.61% 1.75%
1913 1.96% 2.91%
1914 0.87% 2.59%
1915 4.79% 38.94%
1916 4.50% 22.37%
1917 0.00% 87.35%
1918 21.02% 12.67%
1919 3.34% 6.90%
1920 1.13% 10.74%
1921 0.00% 8.53%
1922 7.29% 0.00%
1923 0.00% 1.93%
1924 14.13% 61.05%
1925 11.80% 15.49%
1926 3.81% 3.10%
1927 16.41% 20.77%
1928 22.43% 3.46%
1929 0.00% 9.33%
1930 1.23% 16.23%
1931 9.48% 21.51%
1932 0.00% 0.29%
1933 20.97% 30.66%
1934 55.62% 0.00%
1935 0.00% 47.89%
1936 37.22% 0.55%
1937 2.40% 0.08%
1938 0.51% 0.04%
1939 22.68% 0.00%
1940 24.59% 4.60%
1941 17.69% 1.10%
1942 5.17% 11.23%
1943 5.67% 5.66%
1944 18.34% 1.56%
1945 0.00% 28.88%
1946 0.59% 9.44%
1947 22.69% 11.41%
1948 2.63% 3.22%
1949 5.55% 0.00%
1950 5.67% 16.13%
1951 0.00% 0.00%
1952 0.33% 0.87%
1953 13.53% 34.08%
1954 4.46% 42.85%
1955 11.42% 4.76%
1956 23.70% 4.11%
1957 3.04% 18.13%
1958 33.92% 2.20%
1959 19.02% 11.06%
1960 1.89% 3.10%
1961 0.00% 19.86%
1962 41.47% 4.61%
1963 13.28% 0.46%
1964 12.22% 4.18%
1965 18.16% 9.05%
1966 8.54% 12.96%
1967 0.00% 30.67%
1968 0.00% 16.57%
1969 15.77% 1.17%
1970 3.09% 3.11%
1971 0.00% 25.41%
1972 0.78% 5.57%
1973 5.76% 8.70%
1974 16.13% 10.90%
1975 8.89% 17.27%
1976 0.00% 29.38%
1977 29.28% 21.39%
1978 2.98% 1.03%
1979 0.12% 12.17%
1980 4.06% 10.20%
1981 0.00% 15.54%
1982 11.85% 0.00%
1983 0.87% 26.78%
1984 13.75% 3.34%
1985 7.18% 0.00%
1986 1.44% 0.00%
1987 38.52% 1.20%
1988 12.34% 1.98%
1989 9.88% 5.78%
1990 1.10% 1.16%
1991 34.09% 9.47%
1992 23.33% 16.41%
1993 10.01% 4.68%
1994 10.01% 10.44%
1995 4.00% 27.09%
1996 30.05% 9.90%
1997 18.67% 38.71%
1998 47.85% 11.42%
1999 2.08% 3.23%
2000 36.45% 0.00%
2001 27.06% 0.00%
2002 6.76% 8.23%
2003 16.18% 0.41%
2004 27.23% 0.83%
2005 2.86% 11.75%