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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September Very Wet: Very Dry:
1895 5.77% 24.42%
1896 10.14% 1.40%
1897 5.72% 30.19%
1898 5.90% 10.48%
1899 0.00% 29.44%
1900 16.69% 3.91%
1901 11.14% 7.11%
1902 5.69% 6.01%
1903 4.49% 15.47%
1904 12.38% 12.09%
1905 6.11% 0.91%
1906 14.46% 2.92%
1907 8.37% 5.96%
1908 4.30% 19.38%
1909 6.09% 7.65%
1910 4.92% 7.04%
1911 13.92% 4.84%
1912 7.79% 8.48%
1913 9.59% 0.50%
1914 3.95% 8.22%
1915 10.43% 5.25%
1916 1.30% 2.98%
1917 3.57% 5.96%
1918 13.47% 6.83%
1919 11.71% 10.67%
1920 4.35% 2.27%
1921 9.24% 7.37%
1922 0.46% 29.12%
1923 16.26% 2.80%
1924 13.81% 3.88%
1925 14.47% 3.60%
1926 21.55% 6.69%
1927 14.54% 8.85%
1928 6.97% 26.36%
1929 11.15% 7.75%
1930 2.26% 4.66%
1931 4.22% 18.85%
1932 6.65% 20.32%
1933 4.47% 4.99%
1934 11.16% 3.99%
1935 6.71% 13.68%
1936 12.49% 1.17%
1937 0.00% 6.29%
1938 12.60% 9.86%
1939 8.88% 26.13%
1940 19.16% 17.78%
1941 27.22% 9.52%
1942 4.18% 10.27%
1943 1.99% 22.48%
1944 4.64% 9.79%
1945 18.74% 3.73%
1946 9.86% 2.03%
1947 3.11% 9.49%
1948 1.49% 19.77%
1949 0.00% 1.72%
1950 10.88% 3.47%
1951 6.23% 10.31%
1952 1.01% 21.51%
1953 3.17% 47.62%
1954 6.02% 15.19%
1955 2.13% 14.20%
1956 1.69% 45.99%
1957 14.20% 13.00%
1958 12.08% 6.67%
1959 17.46% 7.09%
1960 3.96% 12.69%
1961 22.25% 6.64%
1962 6.39% 0.94%
1963 6.86% 7.29%
1964 4.81% 9.72%
1965 25.25% 3.04%
1966 3.93% 3.02%
1967 9.70% 3.40%
1968 5.69% 16.06%
1969 2.07% 6.05%
1970 13.02% 6.33%
1971 9.82% 1.06%
1972 6.71% 4.93%
1973 26.99% 8.14%