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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% |
