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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 Warm: | Very Cold: |
|---|---|---|
| 1895 | 0.31% | 8.79% |
| 1896 | 30.47% | 0.00% |
| 1897 | 0.00% | 7.49% |
| 1898 | 0.00% | 35.33% |
| 1899 | 1.93% | 2.11% |
| 1900 | 14.83% | 0.00% |
| 1901 | 0.00% | 3.92% |
| 1902 | 0.00% | 5.11% |
| 1903 | 1.36% | 25.82% |
| 1904 | 0.00% | 6.24% |
| 1905 | 0.61% | 23.86% |
| 1906 | 19.28% | 0.59% |
| 1907 | 1.22% | 0.00% |
| 1908 | 2.95% | 4.80% |
| 1909 | 0.00% | 76.03% |
| 1910 | 0.00% | 13.81% |
| 1911 | 4.92% | 21.89% |
| 1912 | 1.32% | 12.21% |
| 1913 | 12.09% | 9.86% |
| 1914 | 0.00% | 62.76% |
| 1915 | 0.00% | 0.84% |
| 1916 | 0.00% | 42.31% |
| 1917 | 23.68% | 51.29% |
| 1918 | 18.45% | 9.73% |
| 1919 | 0.95% | 37.52% |
| 1920 | 1.34% | 0.41% |
| 1921 | 20.86% | 0.10% |
| 1922 | 17.47% | 3.42% |
| 1923 | 41.37% | 0.00% |
| 1924 | 0.00% | 53.52% |
| 1925 | 9.69% | 5.96% |
