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| December |
|---|
| Very Warm: |
| Very Cold: |
| 1895 | 1896 | 1897 | 1898 | 1899 | 1900 | 1901 | 1902 | 1903 | 1904 | 1905 | 1906 | 1907 | 1908 | 1909 | 1910 | 1911 | 1912 | 1913 | 1914 | 1915 | 1916 | 1917 | 1918 | 1919 | 1920 | 1921 | 1922 | 1923 | 1924 | 1925 | 1926 | 1927 | 1928 | 1929 | 1930 | 1931 | 1932 | 1933 | 1934 | 1935 | 1936 | 1937 | 1938 | 1939 | 1940 | 1941 | 1942 | 1943 | 1944 | 1945 | 1946 | 1947 | 1948 | 1949 | 1950 | 1951 | 1952 | 1953 | 1954 | 1955 | 1956 | 1957 | 1958 | 1959 | 1960 | 1961 | 1962 | 1963 | 1964 | 1965 | 1966 | 1967 | 1968 | 1969 | 1970 | 1971 | 1972 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.31% | 30.47% | 0.00% | 0.00% | 1.93% | 14.83% | 0.00% | 0.00% | 1.36% | 0.00% | 0.61% | 19.28% | 1.22% | 2.95% | 0.00% | 0.00% | 4.92% | 1.32% | 12.09% | 0.00% | 0.00% | 0.00% | 23.68% | 18.45% | 0.95% | 1.34% | 20.86% | 17.47% | 41.37% | 0.00% | 9.69% | 0.95% | 0.00% | 5.01% | 15.80% | 0.00% | 39.36% | 3.33% | 52.46% | 0.78% | 0.00% | 0.00% | 1.68% | 0.22% | 52.17% | 6.20% | 15.41% | 4.26% | 0.42% | 0.00% | 0.00% | 21.62% | 0.00% | 4.80% | 0.10% | 25.86% | 0.39% | 2.67% | 6.36% | 5.76% | 1.14% | 23.88% | 33.00% | 23.36% | 20.15% | 0.00% | 0.00% | 3.25% | 0.00% | 0.00% | 22.19% | 1.33% | 0.10% | 0.00% | 0.00% | 10.46% | 27.10% | 1.89% | 2.04% | 1.69% | 0.00% | 0.21% | 21.51% | 0.45% | 14.13% | 26.50% | 11.99% | 27.38% | 0.00% | 32.95% | 0.00% | 6.76% | 5.95% | 0.30% | 0.21% | 5.77% | 8.14% | 0.00% | 2.89% | 11.12% | 6.37% | 5.35% | 10.29% | 17.46% | 14.32% | 0.59% | 25.37% | 7.81% | 4.77% | 2.63% | 1.54% | 22.78% | 4.99% | 0.54% | 0.00% | 15.01% | 17.41% | 19.98% |
| 8.79% | 0.00% | 7.49% | 35.33% | 2.11% | 0.00% | 3.92% | 5.11% | 25.82% | 6.24% | 23.86% | 0.59% | 0.00% | 4.80% | 76.03% | 13.81% | 21.89% | 12.21% | 9.86% | 62.76% | 0.84% | 42.31% | 51.29% | 9.73% | 37.52% | 0.41% | 0.10% | 3.42% | 0.00% | 53.52% | 5.96% | 1.55% | 39.04% | 2.51% | 0.00% | 15.86% | 14.77% | 41.72% | 2.85% | 0.20% | 20.14% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.19% | 5.03% | 3.35% | 24.93% | 0.00% | 0.93% | 19.63% | 0.84% | 10.26% | 12.65% | 0.25% | 6.38% | 0.45% | 10.49% | 0.00% | 0.00% | 14.91% | 0.00% | 19.43% | 5.21% | 2.61% | 52.44% | 8.35% | 3.05% | 0.19% | 22.00% | 16.54% | 0.26% | 1.40% | 15.27% | 33.16% | 0.00% | 3.77% | 0.00% | 16.84% | 0.00% | 31.47% | 0.00% | 3.47% | 0.74% | 0.00% | 60.62% | 12.28% | 38.63% | 0.17% | 2.18% | 0.00% | 57.68% | 34.65% | 1.72% | 8.73% | 0.00% | 0.00% | 0.13% | 8.62% | 3.24% | 0.35% | 0.00% | 54.92% | 0.67% | 0.00% | 0.00% | 0.00% | 0.41% | 0.00% | 1.67% | 8.44% | 38.02% | 18.23% | 2.74% | 0.25% |
The percentage areas of the contiguous United States are computed based on the climate division data set. Those climate divisions having the monthly average temperature in the top ten percent (> 90th percentile) of their historical distribution are very warm and those in the bottom ten percent (< 10th percentile) are very cold.
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