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| May |
|---|
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4.80% | 56.10% | 31.61% | 4.58% | 21.14% | 19.56% | 17.06% | 27.78% | 0.04% | 5.16% | 11.10% | 1.03% | 0.75% | 0.02% | 0.00% | 12.62% | 20.08% | 2.79% | 4.30% | 1.47% | 5.64% | 4.80% | 0.00% | 17.18% | 1.74% | 1.68% | 0.23% | 5.86% | 0.00% | 14.99% | 11.11% | 2.29% | 14.46% | 21.54% | 0.00% | 0.42% | 12.06% | 0.31% | 20.10% | 55.34% | 1.61% | 37.49% | 4.44% | 0.79% | 19.55% | 21.47% | 14.91% | 4.82% | 8.39% | 16.92% | 0.00% | 1.34% | 20.72% | 1.83% | 5.85% | 5.65% | 0.43% | 2.06% | 14.30% | 6.96% | 11.98% | 24.32% | 1.86% | 32.86% | 21.09% | 1.89% | 0.00% | 42.46% | 9.56% | 13.71% | 18.14% | 6.25% | 0.00% | 0.00% | 14.00% | 3.58% | 0.00% | 0.84% | 4.70% | 14.08% | 8.58% | 0.13% | 30.57% | 4.26% | 0.25% | 4.55% | 0.17% | 10.06% | 0.87% | 16.12% | 9.47% | 3.95% | 38.37% | 13.36% | 11.30% | 1.10% | 34.34% | 24.13% | 10.61% | 9.30% | 4.62% | 29.64% | 19.71% | 40.34% | 4.10% | 33.98% | 25.34% | 8.02% | 15.86% | 27.89% | 2.94% | 23.68% | 13.59% | 3.99% | 21.13% | 15.50% | 2.46% | 48.64% |
| 3.98% | 18.21% | 5.53% | 5.76% | 18.42% | 1.42% | 0.12% | 0.00% | 14.05% | 1.30% | 17.23% | 2.32% | 70.79% | 22.82% | 18.09% | 23.62% | 9.70% | 4.39% | 8.20% | 3.45% | 37.35% | 25.82% | 84.26% | 9.84% | 8.34% | 6.61% | 5.35% | 0.00% | 1.77% | 56.62% | 15.32% | 4.36% | 17.94% | 3.66% | 8.59% | 19.14% | 22.56% | 3.77% | 30.13% | 0.00% | 48.64% | 0.10% | 0.08% | 0.03% | 0.00% | 5.15% | 1.10% | 12.83% | 10.68% | 2.28% | 27.91% | 12.08% | 12.05% | 4.05% | 0.00% | 16.56% | 0.00% | 0.84% | 31.35% | 40.92% | 5.33% | 3.95% | 14.90% | 0.87% | 11.87% | 5.17% | 18.12% | 8.73% | 0.46% | 4.41% | 9.36% | 12.34% | 29.15% | 15.24% | 0.28% | 3.47% | 24.14% | 4.55% | 10.33% | 10.56% | 16.06% | 29.63% | 19.94% | 2.18% | 11.42% | 8.11% | 15.69% | 1.01% | 24.23% | 4.64% | 0.00% | 0.00% | 1.20% | 3.85% | 5.62% | 2.28% | 6.07% | 18.34% | 6.11% | 13.31% | 22.47% | 9.15% | 38.81% | 7.41% | 3.25% | 0.00% | 0.00% | 10.58% | 0.86% | 2.50% | 14.53% | 1.05% | 1.17% | 4.81% | 0.21% | 20.82% | 22.67% | 0.00% |
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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http://www.ncdc.noaa.gov/temp-and-precip/uspa/index.php