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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 Warm: | Very Cold: |
|---|---|---|
| 1895 | 33.27% | 11.81% |
| 1896 | 5.83% | 22.63% |
| 1897 | 27.96% | 5.62% |
| 1898 | 8.64% | 1.20% |
| 1899 | 9.29% | 3.15% |
| 1900 | 28.28% | 11.06% |
| 1901 | 0.73% | 18.01% |
| 1902 | 1.64% | 20.15% |
| 1903 | 0.59% | 15.93% |
| 1904 | 1.08% | 3.33% |
| 1905 | 8.20% | 0.25% |
| 1906 | 27.51% | 1.28% |
| 1907 | 1.01% | 6.71% |
| 1908 | 15.59% | 1.50% |
| 1909 | 0.00% | 0.74% |
| 1910 | 18.28% | 2.20% |
| 1911 | 37.96% | 11.83% |
| 1912 | 10.68% | 40.60% |
| 1913 | 2.94% | 21.30% |
| 1914 | 0.59% | 10.43% |
| 1915 | 6.13% | 12.24% |
| 1916 | 0.00% | 6.89% |
| 1917 | 0.00% | 8.66% |
| 1918 | 2.57% | 57.78% |
| 1919 | 3.25% | 2.18% |
| 1920 | 8.56% | 7.40% |
| 1921 | 46.07% | 11.74% |
| 1922 | 23.53% | 1.12% |
| 1923 | 2.33% | 11.09% |
| 1924 | 0.00% | 30.79% |
| 1925 | 37.41% | 11.04% |
| 1926 | 18.93% | 28.12% |
| 1927 | 7.67% | 9.79% |
| 1928 | 0.00% | 20.29% |
| 1929 | 0.97% | 16.04% |
| 1930 | 16.81% | 6.81% |
| 1931 | 59.41% | 4.14% |
| 1932 | 2.19% | 6.88% |
| 1933 | 60.81% | 5.76% |
| 1934 | 4.62% | 16.12% |
| 1935 | 2.88% | 9.19% |
| 1936 | 28.34% | 1.15% |
| 1937 | 4.67% | 2.06% |
| 1938 | 18.62% | 2.25% |
| 1939 | 34.88% | 2.28% |
| 1940 | 18.00% | 10.85% |
| 1941 | 10.74% | 28.44% |
| 1942 | 0.00% | 12.23% |
| 1943 | 5.84% | 14.19% |
| 1944 | 2.63% | 0.00% |
| 1945 | 12.40% | 2.84% |
| 1946 | 3.18% | 0.56% |
| 1947 | 17.28% | 0.00% |
| 1948 | 22.65% | 1.03% |
| 1949 | 4.92% | 21.67% |
| 1950 | 0.10% | 6.82% |
| 1951 | 4.25% | 17.72% |
| 1952 | 6.85% | 0.11% |
| 1953 | 5.69% | 0.00% |
| 1954 | 34.16% | 1.01% |
| 1955 | 2.46% | 0.00% |
| 1956 | 16.53% | 11.69% |
| 1957 | 1.85% | 1.23% |
| 1958 | 1.00% | 0.00% |
| 1959 | 6.45% | 2.42% |
| 1960 | 6.57% | 0.10% |
| 1961 | 11.57% | 38.37% |
| 1962 | 0.84% | 8.84% |
| 1963 | 27.34% | 9.16% |
| 1964 | 0.00% | 5.47% |
| 1965 | 0.27% | 48.75% |
| 1966 | 6.45% | 7.16% |
| 1967 | 15.27% | 33.20% |
| 1968 | 1.35% | 11.74% |
| 1969 | 4.91% | 1.40% |
| 1970 | 14.12% | 21.85% |
| 1971 | 6.32% | 19.85% |
| 1972 | 5.83% | 8.34% |
| 1973 | 1.14% | 6.05% |
| 1974 | 5.41% | 47.79% |
