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

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/total precipitation in the top ten percent (> 90th percentile) of their historical distribution are very warm/wet and those in the bottom ten percent (< 10th percentile) are very cold/dry.

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May Very Warm: Very Cold:
1895 4.80% 3.98%
1896 56.10% 18.21%
1897 31.61% 5.53%
1898 4.58% 5.76%
1899 21.14% 18.42%
1900 19.56% 1.42%
1901 17.06% 0.12%
1902 27.78% 0.00%
1903 0.04% 14.05%
1904 5.16% 1.30%
1905 11.10% 17.23%
1906 1.03% 2.32%
1907 0.75% 70.79%
1908 0.02% 22.82%
1909 0.00% 18.09%
1910 12.62% 23.62%
1911 20.08% 9.70%
1912 2.79% 4.39%
1913 4.30% 8.20%
1914 1.47% 3.45%
1915 5.64% 37.35%
1916 4.80% 25.82%
1917 0.00% 84.26%
1918 17.18% 9.84%
1919 1.74% 8.34%
1920 1.68% 6.61%
1921 0.23% 5.35%
1922 5.86% 0.00%
1923 0.00% 1.77%
1924 14.99% 56.62%
1925 11.11% 15.32%
1926 2.29% 4.36%
1927 14.46% 17.94%
1928 21.54% 3.66%
1929 0.00% 8.59%
1930 0.42% 19.14%
1931 12.06% 22.56%
1932 0.31% 3.77%
1933 20.10% 30.13%
1934 55.34% 0.00%
1935 1.61% 48.64%
1936 37.49% 0.10%
1937 4.44% 0.08%
1938 0.79% 0.03%
1939 19.55% 0.00%
1940 21.47% 5.15%
1941 14.91% 1.10%
1942 4.82% 12.83%
1943 8.39% 10.68%
1944 16.92% 2.28%
1945 0.00% 27.91%
1946 1.34% 12.08%
1947 20.72% 12.05%
1948 1.83% 4.05%
1949 5.85% 0.00%
1950 5.65% 16.56%
1951 0.43% 0.00%
1952 2.06% 0.84%
1953 14.30% 31.35%
1954 6.96% 40.92%
1955 11.98% 5.33%
1956 24.32% 3.95%
1957 1.86% 14.90%
1958 32.86% 0.87%
1959 21.09% 11.87%
1960 1.89% 5.17%
1961 0.00% 18.12%
1962 42.46% 8.73%
1963 9.56% 0.46%
1964 13.71% 4.41%
1965 18.14% 9.36%
1966 6.25% 12.34%
1967 0.00% 29.15%
1968 0.00% 15.24%
1969 14.00% 0.28%
1970 3.58% 3.47%
1971 0.00% 24.14%
1972 0.84% 4.55%
1973 4.70% 10.33%
1974 14.08% 10.56%
1975 8.58% 16.06%
1976 0.13% 29.63%
1977 30.57% 19.94%
1978 4.26% 2.18%
1979 0.25% 11.42%
1980 4.55% 8.11%
1981 0.17% 15.69%
1982 10.06% 1.01%
1983 0.87% 24.23%
1984 16.12% 4.64%
1985 9.47% 0.00%
1986 3.95% 0.00%
1987 38.37% 1.20%
1988 13.36% 3.85%
1989 11.30% 5.62%
1990 1.10% 2.28%
1991 34.34% 6.07%
1992 24.13% 18.34%
1993 10.61% 6.11%
1994 9.30% 13.31%
1995 4.62% 22.47%
1996 29.64% 9.15%
1997 19.71% 38.81%
1998 40.34% 7.41%
1999 4.10% 3.25%
2000 33.98% 0.00%
2001 25.34% 0.00%
2002 8.02% 10.58%
2003 15.86% 0.86%
2004 27.89% 2.50%
2005 2.94% 14.53%
2006 23.68% 1.05%
2007 13.59% 1.17%
2008 3.99% 4.81%
2009 21.13% 0.21%
2010 15.50% 20.82%
2011 2.46% 22.67%
2012 48.64% 0.00%
2013 2.89% 2.84%