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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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| September | Very Wet: | Very Dry: |
|---|---|---|
| 1895 | 0.71% | 14.07% |
| 1896 | 4.61% | 0.57% |
| 1897 | 3.31% | 24.33% |
| 1898 | 7.06% | 13.29% |
| 1899 | 0.09% | 19.46% |
| 1900 | 9.91% | 2.01% |
| 1901 | 5.94% | 4.17% |
| 1902 | 0.52% | 5.78% |
| 1903 | 3.91% | 14.80% |
| 1904 | 8.52% | 7.61% |
| 1905 | 4.99% | 0.35% |
| 1906 | 9.15% | 6.40% |
| 1907 | 7.12% | 2.75% |
| 1908 | 2.55% | 17.85% |
| 1909 | 6.06% | 6.15% |
| 1910 | 2.48% | 4.60% |
| 1911 | 8.66% | 0.47% |
| 1912 | 8.64% | 2.86% |
| 1913 | 9.52% | 2.66% |
| 1914 | 2.23% | 11.95% |
| 1915 | 8.81% | 4.67% |
| 1916 | 0.09% | 1.73% |
| 1917 | 3.25% | 7.00% |
| 1918 | 14.87% | 6.55% |
| 1919 | 6.02% | 9.72% |
| 1920 | 3.77% | 2.38% |
| 1921 | 9.69% | 3.13% |
| 1922 | 0.08% | 23.05% |
| 1923 | 13.25% | 4.26% |
| 1924 | 11.07% | 7.23% |
| 1925 | 5.16% | 2.52% |
| 1926 | 19.00% | 10.25% |
| 1927 | 12.53% | 7.09% |
| 1928 | 6.89% | 20.04% |
| 1929 | 11.97% | 6.33% |
| 1930 | 4.50% | 4.42% |
| 1931 | 4.23% | 16.14% |
| 1932 | 7.08% | 20.10% |
| 1933 | 4.57% | 6.16% |
| 1934 | 10.66% | 4.37% |
| 1935 | 5.01% | 12.87% |
| 1936 | 14.66% | 3.61% |
| 1937 | 0.22% | 8.14% |
| 1938 | 11.95% | 8.32% |
| 1939 | 9.61% | 24.86% |
| 1940 | 17.63% | 20.07% |
| 1941 | 24.51% | 9.89% |
| 1942 | 5.53% | 7.68% |
| 1943 | 1.95% | 21.09% |
| 1944 | 5.32% | 6.27% |
| 1945 | 19.17% | 2.13% |
| 1946 | 9.59% | 2.10% |
| 1947 | 3.54% | 11.17% |
| 1948 | 1.92% | 19.46% |
| 1949 | 1.09% | 2.15% |
| 1950 | 10.16% | 3.20% |
| 1951 | 5.28% | 6.19% |
| 1952 | 1.17% | 20.48% |
| 1953 | 3.03% | 42.12% |
| 1954 | 5.49% | 15.75% |
| 1955 | 2.45% | 13.49% |
| 1956 | 2.49% | 42.07% |
| 1957 | 14.33% | 12.75% |
| 1958 | 10.92% | 5.14% |
| 1959 | 18.52% | 7.75% |
| 1960 | 3.98% | 10.51% |
| 1961 | 21.08% | 5.97% |
| 1962 | 6.43% | 0.47% |
| 1963 | 6.72% | 6.39% |
| 1964 | 5.65% | 10.90% |
| 1965 | 24.16% | 3.27% |
| 1966 | 4.24% | 2.91% |
| 1967 | 9.49% | 3.14% |
| 1968 | 5.81% | 13.35% |
| 1969 | 2.11% | 4.05% |
| 1970 | 13.30% | 2.19% |
| 1971 | 7.92% | 1.31% |
| 1972 | 5.12% | 4.89% |
| 1973 | 26.33% | 7.68% |
| 1974 | 12.11% | 22.35% |
| 1975 | 11.66% | 12.28% |
| 1976 | 11.00% | 7.66% |
| 1977 | 19.93% | 2.44% |
| 1978 | 17.68% | 11.97% |
| 1979 | 15.97% | 28.33% |
| 1980 | 13.02% | 4.48% |
| 1981 | 2.92% | 3.88% |
| 1982 | 16.71% | 4.09% |
| 1983 | 8.55% | 4.29% |
| 1984 | 2.51% | 12.56% |
| 1985 | 18.32% | 8.14% |
| 1986 | 33.15% | 3.55% |
| 1987 | 3.78% | 13.49% |
| 1988 | 8.17% | 2.40% |
| 1989 | 12.18% | 6.75% |
| 1990 | 2.33% | 15.54% |
| 1991 | 7.39% | 7.30% |
| 1992 | 3.11% | 4.15% |
