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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September Very Warm: Very Cold:
1895 25.45% 12.02%
1896 0.11% 25.89%
1897 26.19% 5.82%
1898 3.54% 0.83%
1899 2.48% 4.21%
1900 28.86% 17.80%
1901 0.00% 23.34%
1902 0.10% 21.61%
1903 0.00% 20.09%
1904 1.56% 2.80%
1905 5.40% 0.00%
1906 28.74% 2.37%
1907 0.96% 9.10%
1908 16.77% 4.79%
1909 0.00% 6.12%
1910 16.23% 4.06%
1911 36.41% 11.98%
1912 8.41% 43.04%
1913 0.35% 19.48%
1914 0.50% 9.81%
1915 3.33% 6.04%
1916 0.00% 5.46%
1917 0.00% 13.25%
1918 1.52% 57.60%
1919 1.33% 1.51%
1920 7.80% 5.43%
1921 45.67% 12.19%
1922 12.56% 1.10%
1923 0.00% 9.84%
1924 0.00% 29.79%
1925 35.27% 12.54%
1926 19.54% 25.04%
1927 6.88% 11.40%
1928 0.00% 23.37%
1929 0.00% 17.49%
1930 16.01% 6.62%
1931 61.83% 1.81%
1932 1.12% 4.57%
1933 61.44% 5.06%
1934 3.55% 12.99%
1935 2.43% 9.46%
1936 24.94% 0.00%
1937 1.57% 2.73%
1938 17.58% 2.88%
1939 32.92% 0.00%
1940 17.07% 9.43%
1941 9.42% 28.81%
1942 0.00% 12.19%
1943 7.70% 13.27%
1944 0.89% 1.20%
1945 9.88% 0.25%
1946 1.64% 0.00%
1947 15.45% 0.00%
1948 19.04% 0.75%
1949 2.04% 21.88%
1950 0.10% 7.43%
1951 2.04% 17.96%
1952 3.80% 0.00%
1953 4.94% 0.00%
1954 34.18% 0.00%
1955 0.90% 0.00%
1956 12.71% 12.78%
1957 1.46% 1.38%
1958 1.00% 0.00%
1959 6.58% 0.00%
1960 5.78% 0.10%
1961 11.36% 39.30%
1962 0.10% 8.69%
1963 26.83% 9.39%
1964 0.00% 2.31%
1965 0.00% 48.59%
1966 6.70% 5.31%
1967 14.97% 31.69%
1968 1.66% 11.17%
1969 2.17% 0.19%
1970 14.71% 22.43%
1971 8.21% 18.61%
1972 6.26% 9.14%
1973 1.34% 3.88%
1974 7.23% 44.98%
1975 0.90% 41.92%
1976 0.00% 7.89%
1977 12.49% 0.00%
1978 18.43% 7.85%
1979 22.84% 3.04%
1980 17.54% 0.00%
1981 0.50% 2.39%
1982 1.20% 0.00%
1983 12.23% 3.24%
1984 3.42% 16.48%
1985 0.00% 36.06%
1986 4.42% 34.97%
1987 2.93% 0.48%
1988 1.10% 2.35%
1989 0.90% 12.81%
1990 29.85% 0.00%
1991 6.75% 9.42%
1992 0.00% 0.00%
1993 0.00% 24.72%
1994 13.16% 0.51%
1995 6.46% 2.56%
1996 0.08% 5.65%
1997 11.88% 0.00%
1998 72.49% 0.00%
1999 3.53% 0.00%
2000 10.35% 0.00%
2001 25.23% 2.57%
2002 20.37% 0.00%
2003 14.80% 3.22%
2004 9.37% 0.00%
2005 47.34% 0.00%
2006 0.00% 20.54%
2007 12.10% 0.00%
2008 5.69% 1.30%
2009 30.79% 0.00%
2010 25.07% 0.00%
2011 30.98% 0.69%
2012 16.62% 0.00%
2013 25.45% 0.00%
2014 13.13% 0.00%
2015 58.26% 0.00%
2016 35.66% 0.00%
2017 14.62% 0.00%