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
April Very Warm: Very Cold:
1895 15.61% 0.19%
1896 32.87% 10.12%
1897 0.42% 0.00%
1898 6.16% 17.41%
1899 0.38% 2.39%
1900 10.60% 8.51%
1901 0.00% 22.27%
1902 5.38% 1.59%
1903 0.00% 3.07%
1904 0.80% 30.37%
1905 0.00% 3.54%
1906 8.15% 0.00%
1907 0.00% 52.42%
1908 14.24% 1.35%
1909 0.00% 26.35%
1910 28.23% 0.84%
1911 0.74% 5.64%
1912 1.28% 14.77%
1913 1.04% 4.08%
1914 0.00% 2.67%
1915 45.75% 1.64%
1916 0.00% 4.74%
1917 0.00% 20.14%
1918 0.00% 20.54%
1919 0.00% 0.45%
1920 0.00% 55.85%
1921 13.07% 0.47%
1922 7.35% 19.73%
1923 0.00% 1.71%
1924 0.00% 0.47%
1925 49.84% 0.45%
1926 17.77% 37.30%
1927 14.43% 1.17%
1928 0.00% 37.26%
1929 11.60% 9.94%
1930 40.99% 0.00%
1931 1.97% 13.41%
1932 0.00% 0.42%
1933 0.00% 9.66%
1934 30.22% 0.00%
1935 0.00% 7.78%
1936 2.25% 18.49%
1937 0.00% 0.00%
1938 0.00% 0.00%
1939 6.06% 3.93%
1940 0.35% 9.13%
1941 21.08% 10.87%
1942 15.58% 0.00%
1943 31.05% 9.69%
1944 0.00% 15.81%
1945 12.13% 13.60%
1946 43.16% 0.00%
1947 5.65% 1.16%
1948 42.22% 4.54%
1949 9.37% 4.21%
1950 0.00% 38.19%
1951 0.17% 12.02%
1952 6.87% 6.99%
1953 0.00% 23.34%
1954 53.67% 2.18%
1955 48.31% 13.79%
1956 0.00% 10.29%
1957 4.82% 3.29%
1958 0.00% 2.88%
1959 5.90% 3.11%
1960 6.03% 0.00%
1961 0.00% 33.49%
1962 9.71% 4.51%
1963 16.36% 11.54%
1964 0.67% 0.53%
1965 13.19% 1.16%
1966 1.45% 10.89%
1967 27.26% 23.68%
1968 4.20% 6.20%
1969 4.02% 0.00%
1970 4.14% 35.74%
1971 0.00% 0.89%
1972 8.80% 9.81%
1973 0.00% 28.51%
1974 0.16% 0.00%
1975 0.00% 59.97%
1976 3.60% 0.00%
1977 27.51% 0.00%
1978 4.07% 0.00%
1979 0.00% 3.81%
1980 8.88% 2.32%
1981 53.61% 0.00%
1982 0.45% 23.04%
1983 0.00% 63.05%
1984 0.23% 10.80%
1985 23.31% 0.00%
1986 15.50% 0.75%
1987 42.42% 10.21%
1988 0.25% 0.00%
1989 25.44% 0.00%
1990 19.17% 0.00%
1991 18.42% 0.00%
1992 27.32% 0.38%
1993 0.46% 18.18%
1994 7.14% 0.00%
1995 0.24% 8.04%
1996 1.08% 5.17%
1997 0.00% 49.78%
1998 5.10% 4.74%
1999 15.36% 5.54%
2000 24.36% 1.22%
2001 23.28% 0.00%
2002 32.62% 0.00%
2003 1.16% 1.83%
2004 4.39% 0.40%
2005 10.04% 2.67%
2006 67.01% 0.00%
2007 0.00% 12.29%
2008 6.74% 9.67%
2009 1.10% 0.00%
2010 32.21% 0.00%
2011 25.37% 8.34%
2012 43.64% 0.00%
2013 3.01% 23.02%
2014 1.61% 0.32%
2015 8.12% 0.00%
2016 12.34% 0.00%
2017 30.95% 0.00%