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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 Wet: | Very Dry: |
|---|---|---|
| 1895 | 13.65% | 8.75% |
| 1896 | 0.00% | 26.38% |
| 1897 | 3.45% | 2.49% |
| 1898 | 1.80% | 12.18% |
| 1899 | 0.00% | 2.23% |
| 1900 | 0.00% | 18.81% |
| 1901 | 14.00% | 5.38% |
| 1902 | 16.47% | 1.45% |
| 1903 | 0.48% | 19.75% |
| 1904 | 0.00% | 3.63% |
| 1905 | 9.61% | 20.03% |
| 1906 | 14.99% | 0.36% |
| 1907 | 4.10% | 2.85% |
| 1908 | 2.76% | 16.68% |
| 1909 | 21.72% | 2.08% |
| 1910 | 0.00% | 7.18% |
| 1911 | 23.67% | 1.12% |
| 1912 | 3.26% | 13.98% |
| 1913 | 24.86% | 18.01% |
| 1914 | 12.75% | 10.90% |
| 1915 | 2.46% | 1.00% |
| 1916 | 8.86% | 7.72% |
| 1917 | 9.96% | 41.94% |
| 1918 | 19.16% | 3.56% |
| 1919 | 0.00% | 11.92% |
| 1920 | 4.68% | 3.67% |
| 1921 | 11.95% | 5.76% |
| 1922 | 4.34% | 17.51% |
| 1923 | 19.58% | 1.96% |
| 1924 | 11.34% | 0.75% |
| 1925 | 2.18% | 12.80% |
| 1926 | 14.88% | 2.29% |
| 1927 | 9.63% | 0.65% |
| 1928 | 0.00% | 10.17% |
| 1929 | 6.10% | 17.34% |
| 1930 | 0.36% | 36.80% |
