U.S. Percentage Areas (Very Warm/Cold, Very Wet/Dry)

NCEI added Alaska climate divisions to its nClimDiv dataset on Friday, March 6, 2015, coincident with the release of the February 2015 monthly monitoring report. For more information on this data, please visit the Alaska Climate Divisions FAQ.

Contiguous United States percentage area products are derived from standardized temperature and precipitation values, which are based on the U.S. Climate Divisional Dataset. Climate divisions with a standardized anomaly in the top ten percent (> 90th percentile) of their historical distribution are considered "very warm/wet" and those in the bottom ten percent (< 10th percentile) are classified as "very cold/dry". For more information please contact NCEI.Monitoring.info@noaa.gov.

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Download: xml csv json
December Very Warm: Very Cold:
1895 0.00% 12.49%
1896 18.98% 0.00%
1897 0.00% 10.32%
1898 0.00% 37.30%
1899 0.00% 5.49%
1900 6.53% 0.00%
1901 0.00% 1.78%
1902 0.00% 6.39%
1903 0.00% 27.25%
1904 0.00% 6.15%
1905 0.00% 28.52%
1906 18.73% 0.72%
1907 0.00% 0.00%
1908 0.00% 3.25%
1909 0.00% 77.14%
1910 0.00% 17.61%
1911 3.43% 24.69%
1912 0.09% 12.19%
1913 9.88% 11.62%
1914 0.00% 64.24%
1915 0.00% 1.10%
1916 0.00% 36.62%
1917 22.79% 54.82%
1918 15.45% 7.71%
1919 0.00% 35.07%
1920 0.00% 1.59%
1921 17.04% 0.39%
1922 16.27% 6.76%
1923 40.39% 1.85%
1924 0.00% 56.55%
1925 2.79% 4.74%
1926 0.63% 2.72%
1927 0.00% 43.17%
1928 2.17% 5.95%
1929 15.05% 0.00%
1930 0.00% 17.44%
1931 37.74% 15.91%
1932 2.15% 41.93%
1933 48.05% 3.18%
1934 0.00% 0.10%
1935 0.00% 21.25%
1936 0.00% 0.00%
1937 2.26% 0.00%
1938 0.00% 0.00%
1939 52.09% 0.00%
1940 4.53% 0.00%
1941 12.35% 0.00%
1942 0.32% 0.00%
1943 0.00% 4.88%
1944 0.00% 0.85%
1945 0.00% 26.47%
1946 18.98% 0.00%
1947 0.00% 1.88%
1948 4.00% 18.88%
1949 0.10% 0.00%
1950 26.93% 12.67%
1951 0.08% 15.00%
1952 1.70% 0.87%
1953 4.65% 8.03%
1954 4.40% 0.84%
1955 4.84% 10.47%
1956 20.65% 0.00%
1957 29.61% 0.00%
1958 25.48% 15.11%
1959 18.49% 0.00%
1960 0.00% 20.06%
1961 0.00% 5.14%
1962 1.48% 2.88%
1963 0.00% 52.93%
1964 0.00% 7.78%
1965 22.07% 2.34%
1966 1.39% 0.19%
1967 0.00% 18.84%
1968 0.00% 12.58%
1969 0.00% 0.00%
1970 10.59% 1.20%
1971 27.20% 14.30%
1972 2.22% 31.51%
1973 2.47% 0.00%
1974 2.02% 3.45%
1975 0.00% 0.00%
1976 0.00% 14.28%
1977 21.25% 0.00%
1978 0.45% 35.65%
1979 15.08% 0.00%
1980 25.74% 2.03%
1981 11.17% 0.11%
1982 32.63% 0.00%
1983 0.00% 57.83%
1984 33.87% 11.53%
1985 0.00% 29.45%
1986 4.16% 0.00%
1987 6.59% 1.97%
1988 0.24% 0.00%
1989 0.21% 56.13%
1990 8.01% 34.14%
1991 4.21% 0.00%
1992 0.00% 8.21%
1993 0.00% 0.00%
1994 16.78% 0.00%
1995 4.01% 0.00%
1996 4.74% 5.54%
1997 10.72% 3.24%
1998 22.34% 0.00%
1999 16.46% 0.00%
2000 3.42% 53.39%
2001 26.88% 0.00%
2002 9.79% 0.00%
2003 8.28% 0.00%
2004 3.84% 0.00%
2005 2.07% 0.00%
2006 26.27% 0.00%
2007 8.12% 0.00%
2008 1.79% 5.33%
2009 0.00% 28.19%
2010 12.98% 14.51%
2011 21.44% 1.86%
2012 26.71% 0.00%
2013 1.54% 6.39%
2014 14.92% 0.00%
2015 49.04% 0.00%
2016 7.50% 10.09%