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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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| December | Very Warm: | Very Cold: |
|---|---|---|
| 1895 | 0.31% | 8.79% |
| 1896 | 30.47% | 0.00% |
| 1897 | 0.00% | 7.49% |
| 1898 | 0.00% | 35.33% |
| 1899 | 1.93% | 2.11% |
| 1900 | 14.83% | 0.00% |
| 1901 | 0.00% | 3.92% |
| 1902 | 0.00% | 5.11% |
| 1903 | 1.36% | 25.82% |
| 1904 | 0.00% | 6.24% |
| 1905 | 0.61% | 23.86% |
| 1906 | 19.28% | 0.59% |
| 1907 | 1.22% | 0.00% |
| 1908 | 2.95% | 4.80% |
| 1909 | 0.00% | 76.03% |
| 1910 | 0.00% | 13.81% |
| 1911 | 4.92% | 21.89% |
| 1912 | 1.32% | 12.21% |
| 1913 | 12.09% | 9.86% |
| 1914 | 0.00% | 62.76% |
| 1915 | 0.00% | 0.84% |
| 1916 | 0.00% | 42.31% |
| 1917 | 23.68% | 51.29% |
| 1918 | 18.45% | 9.73% |
| 1919 | 0.95% | 37.52% |
| 1920 | 1.34% | 0.41% |
| 1921 | 20.86% | 0.10% |
| 1922 | 17.47% | 3.42% |
| 1923 | 41.37% | 0.00% |
| 1924 | 0.00% | 53.52% |
| 1925 | 9.69% | 5.96% |
| 1926 | 0.95% | 1.55% |
| 1927 | 0.00% | 39.04% |
| 1928 | 5.01% | 2.51% |
| 1929 | 15.80% | 0.00% |
| 1930 | 0.00% | 15.86% |
| 1931 | 39.36% | 14.77% |
| 1932 | 3.33% | 41.72% |
| 1933 | 52.46% | 2.85% |
| 1934 | 0.78% | 0.20% |
| 1935 | 0.00% | 20.14% |
| 1936 | 0.00% | 0.00% |
| 1937 | 1.68% | 0.00% |
| 1938 | 0.22% | 0.00% |
| 1939 | 52.17% | 0.00% |
| 1940 | 6.20% | 0.00% |
| 1941 | 15.41% | 0.00% |
| 1942 | 4.26% | 0.19% |
| 1943 | 0.42% | 5.03% |
| 1944 | 0.00% | 3.35% |
| 1945 | 0.00% | 24.93% |
| 1946 | 21.62% | 0.00% |
| 1947 | 0.00% | 0.93% |
| 1948 | 4.80% | 19.63% |
| 1949 | 0.10% | 0.84% |
| 1950 | 25.86% | 10.26% |
| 1951 | 0.39% | 12.65% |
| 1952 | 2.67% | 0.25% |
| 1953 | 6.36% | 6.38% |
| 1954 | 5.76% | 0.45% |
| 1955 | 1.14% | 10.49% |
| 1956 | 23.88% | 0.00% |
| 1957 | 33.00% | 0.00% |
| 1958 | 23.36% | 14.91% |
| 1959 | 20.15% | 0.00% |
| 1960 | 0.00% | 19.43% |
| 1961 | 0.00% | 5.21% |
| 1962 | 3.25% | 2.61% |
| 1963 | 0.00% | 52.44% |
| 1964 | 0.00% | 8.35% |
| 1965 | 22.19% | 3.05% |
| 1966 | 1.33% | 0.19% |
| 1967 | 0.10% | 22.00% |
| 1968 | 0.00% | 16.54% |
| 1969 | 0.00% | 0.26% |
| 1970 | 10.46% | 1.40% |
| 1971 | 27.10% | 15.27% |
| 1972 | 1.89% | 33.16% |
| 1973 | 2.04% | 0.00% |
| 1974 | 1.69% | 3.77% |
| 1975 | 0.00% | 0.00% |
| 1976 | 0.21% | 16.84% |
| 1977 | 21.51% | 0.00% |
| 1978 | 0.45% | 31.47% |
| 1979 | 14.13% | 0.00% |
| 1980 | 26.50% | 3.47% |
| 1981 | 11.99% | 0.74% |
| 1982 | 27.38% | 0.00% |
| 1983 | 0.00% | 60.62% |
| 1984 | 32.95% | 12.28% |
| 1985 | 0.00% | 38.63% |
| 1986 | 6.76% | 0.17% |
| 1987 | 5.95% | 2.18% |
| 1988 | 0.30% | 0.00% |
| 1989 | 0.21% | 57.68% |
| 1990 | 5.77% | 34.65% |
