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
January Very Warm: Very Cold:
1895 0.00% 1.70%
1896 3.68% 0.00%
1897 0.00% 4.04%
1898 1.11% 18.60%
1899 0.35% 1.77%
1900 10.12% 0.00%
1901 0.00% 0.00%
1902 0.00% 0.36%
1903 0.00% 0.00%
1904 0.00% 9.45%
1905 1.25% 14.44%
1906 6.80% 0.00%
1907 30.21% 13.38%
1908 0.52% 0.00%
1909 16.64% 2.79%
1910 0.00% 1.91%
1911 25.07% 0.52%
1912 0.00% 38.38%
1913 17.04% 9.62%
1914 20.53% 0.00%
1915 0.00% 1.96%
1916 12.90% 24.07%
1917 0.00% 18.37%
1918 0.10% 57.55%
1919 11.85% 10.08%
1920 0.90% 9.16%
1921 18.37% 0.00%
1922 0.00% 19.63%
1923 27.03% 0.00%
1924 0.00% 6.90%
1925 0.45% 6.73%
1926 0.00% 4.43%
1927 4.29% 0.00%
1928 0.25% 0.00%
1929 0.00% 26.51%
1930 0.00% 49.93%
1931 16.27% 0.00%
1932 28.25% 14.32%
1933 43.11% 6.91%
1934 19.12% 0.00%
1935 10.84% 1.10%
1936 0.00% 9.94%
1937 22.34% 54.52%
1938 0.56% 0.00%
1939 9.43% 0.00%
1940 0.00% 52.18%
1941 0.00% 0.00%
1942 2.69% 0.58%
1943 0.00% 1.59%
1944 12.90% 0.64%
1945 0.19% 4.87%
1946 0.00% 0.48%
1947 3.39% 0.63%
1948 2.34% 14.17%
1949 19.09% 47.78%
1950 34.10% 20.27%
1951 0.00% 0.00%
1952 23.90% 0.00%
1953 46.91% 0.00%
1954 3.82% 0.00%
1955 0.00% 7.06%
1956 12.01% 0.45%
1957 3.36% 16.65%
1958 7.61% 1.54%
1959 0.35% 0.74%
1960 0.00% 1.67%
1961 1.00% 2.67%
1962 0.00% 7.93%
1963 0.00% 38.26%
1964 1.93% 2.19%
1965 4.88% 0.00%
1966 0.00% 12.25%
1967 2.56% 0.00%
1968 0.00% 2.19%
1969 9.35% 7.85%
1970 0.00% 17.69%
1971 1.44% 1.89%
1972 2.05% 1.44%
1973 0.00% 4.20%
1974 13.42% 0.90%
1975 0.84% 0.00%
1976 0.00% 0.43%
1977 0.00% 49.69%
1978 2.82% 43.66%
1979 0.00% 65.29%
1980 3.61% 0.00%
1981 31.45% 7.86%
1982 0.00% 26.74%
1983 12.79% 0.00%
1984 0.00% 3.07%
1985 0.00% 15.54%
1986 38.77% 0.00%
1987 9.48% 0.00%
1988 0.00% 1.80%
1989 26.20% 0.00%
1990 48.74% 0.00%
1991 0.84% 0.00%
1992 19.81% 0.00%
1993 3.74% 0.00%
1994 8.55% 13.87%
1995 5.27% 0.00%
1996 2.60% 0.00%
1997 0.00% 0.00%
1998 21.35% 0.00%
1999 21.41% 0.00%
2000 20.98% 0.00%
2001 3.92% 0.84%
2002 19.99% 0.00%
2003 33.68% 0.84%
2004 0.00% 3.54%
2005 20.42% 0.00%
2006 67.97% 0.00%
2007 3.87% 1.72%
2008 0.33% 0.25%
2009 10.67% 2.57%
2010 6.61% 0.84%
2011 0.46% 0.00%
2012 44.25% 0.00%
2013 2.67% 0.91%
2014 15.30% 6.37%
2015 25.39% 0.00%
2016 1.58% 0.00%
2017 30.66% 0.00%