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
August Very Warm: Very Cold:
1895 1.90% 2.50%
1896 9.38% 2.51%
1897 6.32% 16.46%
1898 12.78% 1.34%
1899 16.62% 27.59%
1900 31.20% 24.16%
1901 8.34% 1.37%
1902 8.14% 16.74%
1903 5.00% 18.82%
1904 0.00% 21.74%
1905 3.33% 3.73%
1906 8.00% 14.63%
1907 0.20% 28.71%
1908 0.00% 23.23%
1909 10.08% 3.96%
1910 4.45% 23.52%
1911 3.56% 25.02%
1912 1.88% 44.38%
1913 14.70% 2.29%
1914 0.10% 6.37%
1915 10.03% 47.51%
1916 0.68% 16.64%
1917 0.00% 21.89%
1918 20.53% 17.21%
1919 2.33% 2.86%
1920 0.36% 30.36%
1921 1.68% 6.79%
1922 6.71% 8.42%
1923 0.72% 24.80%
1924 14.97% 7.04%
1925 0.51% 16.11%
1926 4.26% 0.00%
1927 1.57% 53.22%
1928 3.63% 11.23%
1929 13.73% 9.90%
1930 3.10% 2.52%
1931 4.34% 8.93%
1932 0.00% 0.00%
1933 0.00% 0.55%
1934 30.35% 6.44%
1935 1.77% 0.00%
1936 33.69% 0.10%
1937 48.00% 1.02%
1938 28.54% 0.54%
1939 5.92% 2.93%
1940 4.10% 4.69%
1941 3.62% 9.92%
1942 1.33% 0.00%
1943 28.43% 1.96%
1944 3.87% 0.00%
1945 2.11% 0.25%
1946 0.00% 20.72%
1947 37.63% 2.48%
1948 0.00% 4.07%
1949 1.22% 3.44%
1950 0.00% 45.11%
1951 17.41% 10.34%
1952 14.42% 0.00%
1953 0.00% 2.62%
1954 22.16% 17.58%
1955 26.00% 1.88%
1956 3.04% 13.25%
1957 0.00% 9.56%
1958 26.62% 0.00%
1959 19.88% 1.37%
1960 2.24% 2.60%
1961 19.52% 10.76%
1962 6.46% 0.06%
1963 0.00% 10.56%
1964 0.10% 22.14%
1965 0.00% 9.54%
1966 0.00% 24.38%
1967 17.29% 41.93%
1968 1.92% 33.80%
1969 26.78% 7.26%
1970 12.83% 0.00%
1971 21.43% 17.15%
1972 0.00% 6.77%
1973 7.74% 6.53%
1974 0.00% 31.92%
1975 2.00% 19.55%
1976 1.66% 33.42%
1977 9.70% 17.15%
1978 1.43% 3.12%
1979 0.00% 12.62%
1980 27.38% 11.68%
1981 13.37% 5.44%
1982 3.47% 10.44%
1983 56.17% 1.83%
1984 10.51% 1.76%
1985 0.00% 16.40%
1986 16.45% 15.15%
1987 11.18% 10.17%
1988 18.11% 0.00%
1989 0.36% 2.76%
1990 3.30% 5.94%
1991 12.29% 2.14%
1992 5.82% 57.25%
1993 3.33% 14.05%
1994 22.91% 12.07%
1995 47.86% 1.57%
1996 12.67% 5.09%
1997 5.17% 4.65%
1998 32.61% 0.00%
1999 15.29% 0.00%
2000 37.71% 0.00%
2001 31.51% 0.00%
2002 16.11% 2.09%
2003 40.95% 0.00%
2004 4.69% 46.54%
2005 21.76% 0.00%
2006 22.36% 0.00%
2007 47.57% 0.00%
2008 10.35% 0.10%
2009 9.61% 4.68%
2010 36.51% 0.00%
2011 45.16% 0.00%
2012 38.03% 0.00%
2013 11.92% 0.45%
2014 9.10% 1.75%
2015 20.61% 0.00%
2016 27.61% 0.00%
2017 19.84% 16.80%