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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December Very Warm: Very Cold:
1895 0.00% 12.49%
1896 18.98% 0.00%
1897 0.00% 10.32%
1898 0.00% 37.30%
1899 0.00% 5.49%
1900 6.53% 0.00%
1901 0.00% 1.78%
1902 0.00% 6.39%
1903 0.00% 27.25%
1904 0.00% 6.15%
1905 0.00% 28.52%
1906 18.73% 0.72%
1907 0.00% 0.00%
1908 0.00% 3.25%
1909 0.00% 77.14%
1910 0.00% 17.61%
1911 3.43% 24.69%
1912 0.09% 12.19%
1913 9.88% 11.62%
1914 0.00% 64.24%
1915 0.00% 1.10%
1916 0.00% 36.62%
1917 22.79% 54.82%
1918 15.45% 7.71%
1919 0.00% 35.07%
1920 0.00% 1.59%
1921 17.04% 0.39%
1922 16.27% 6.76%
1923 40.39% 1.85%
1924 0.00% 56.55%
1925 2.79% 4.74%
1926 0.63% 2.72%
1927 0.00% 43.17%
1928 2.17% 5.95%
1929 15.05% 0.00%
1930 0.00% 17.44%
1931 37.74% 15.91%
1932 2.15% 41.93%
1933 48.05% 3.18%
1934 0.00% 0.10%
1935 0.00% 21.25%
1936 0.00% 0.00%
1937 2.26% 0.00%
1938 0.00% 0.00%
1939 52.09% 0.00%
1940 4.53% 0.00%
1941 12.35% 0.00%
1942 0.32% 0.00%
1943 0.00% 4.88%
1944 0.00% 0.85%
1945 0.00% 26.47%
1946 18.98% 0.00%
1947 0.00% 1.88%
1948 4.00% 18.88%
1949 0.10% 0.00%
1950 26.93% 12.67%
1951 0.08% 15.00%
1952 1.70% 0.87%
1953 4.65% 8.03%
1954 4.40% 0.84%
1955 4.84% 10.47%
1956 20.65% 0.00%
1957 29.61% 0.00%
1958 25.48% 15.11%
1959 18.49% 0.00%
1960 0.00% 20.06%
1961 0.00% 5.14%
1962 1.48% 2.88%
1963 0.00% 52.93%
1964 0.00% 7.78%
1965 22.07% 2.34%
1966 1.39% 0.19%
1967 0.00% 18.84%
1968 0.00% 12.58%
1969 0.00% 0.00%
1970 10.59% 1.20%
1971 27.20% 14.30%
1972 2.22% 31.51%
1973 2.47% 0.00%
1974 2.02% 3.45%
1975 0.00% 0.00%
1976 0.00% 14.28%
1977 21.25% 0.00%
1978 0.45% 35.65%
1979 15.08% 0.00%
1980 25.74% 2.03%
1981 11.17% 0.11%
1982 32.63% 0.00%
1983 0.00% 57.83%
1984 33.87% 11.53%
1985 0.00% 29.45%
1986 4.16% 0.00%
1987 6.59% 1.97%
1988 0.24% 0.00%
1989 0.21% 56.13%
1990 8.01% 34.14%
1991 4.21% 0.00%
1992 0.00% 8.21%
1993 0.00% 0.00%
1994 16.78% 0.00%
1995 4.01% 0.00%
1996 4.74% 5.54%
1997 10.72% 3.24%
1998 22.34% 0.00%
1999 16.46% 0.00%
2000 3.42% 53.39%
2001 26.88% 0.00%
2002 9.79% 0.00%
2003 8.28% 0.00%
2004 3.84% 0.00%
2005 2.07% 0.00%
2006 26.27% 0.00%
2007 8.12% 0.00%
2008 1.79% 5.33%
2009 0.00% 28.19%
2010 12.98% 14.51%
2011 21.44% 1.86%
2012 26.71% 0.00%
2013 1.54% 6.39%
2014 14.92% 0.00%
2015 49.04% 0.00%
2016 7.61% 9.69%