U.S. Percentage Areas (Very Warm/Cold, Very Wet/Dry)

NCDC transitioned to the nClimDiv dataset on Thursday, March 13, 2014. This was coincident with the release of the February 2014 monthly monitoring report. For details on this transition, please visit our public FTP site and our U.S. Climate Divisional Database site.

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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April Very Wet: Very Dry:
1895 3.64% 18.92%
1896 18.92% 14.81%
1897 6.02% 4.87%
1898 0.82% 7.51%
1899 1.16% 22.63%
1900 35.35% 9.54%
1901 11.33% 5.35%
1902 2.20% 14.41%
1903 3.85% 11.70%
1904 4.24% 10.12%
1905 21.27% 6.91%
1906 14.37% 16.08%
1907 2.88% 3.99%
1908 12.10% 6.42%
1909 5.67% 21.03%
1910 2.07% 11.53%
1911 12.07% 7.71%
1912 17.26% 0.32%
1913 3.75% 8.34%
1914 9.50% 1.46%
1915 24.83% 24.08%
1916 5.90% 6.92%
1917 11.81% 3.07%
1918 7.60% 8.87%
1919 9.37% 5.17%
1920 22.89% 5.47%
1921 7.22% 3.69%
1922 18.58% 1.38%
1923 12.21% 2.54%