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

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 35.48% 0.00%
2017 14.85% 0.00%