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 Warm: Very Cold:
1895 16.95% 1.38%
1896 33.03% 10.12%
1897 0.42% 0.00%
1898 7.13% 18.35%
1899 0.38% 5.21%
1900 10.86% 8.84%
1901 0.00% 22.47%
1902 5.38% 2.21%
1903 0.00% 3.21%
1904 0.80% 30.82%
1905 0.00% 4.43%
1906 8.41% 0.00%
1907 0.00% 52.85%
1908 14.37% 1.35%
1909 0.00% 27.59%
1910 29.28% 0.84%
1911 0.74% 6.16%
1912 1.28% 15.92%
1913 1.27% 4.08%
1914 0.00% 2.72%
1915 47.88% 2.36%
1916 0.00% 5.73%
1917 0.00% 21.84%
1918 0.00% 21.23%
1919 0.00% 0.45%
1920 0.00% 58.19%
1921 13.07% 0.47%
1922 8.10% 20.93%
1923 0.00% 1.71%
1924 0.00% 1.04%
1925 51.33% 0.45%
1926 18.24% 38.02%
1927 15.18% 1.29%
1928 0.00% 40.12%
1929 12.58% 11.48%
1930 41.56% 0.16%
1931 1.97% 13.41%
1932 0.00% 0.42%
1933 0.00% 9.66%
1934 30.22% 0.23%
1935 0.00% 8.86%
1936 2.67% 19.22%
1937 0.00% 0.00%
1938 0.00% 0.00%
1939 7.43% 4.41%
1940 0.35% 9.65%
1941 21.67% 10.87%
1942 17.96% 0.00%
1943 31.98% 9.69%
1944 0.00% 16.89%
1945 12.82% 17.14%