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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% |
