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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January Very Warm: Very Cold:
1895 0.00% 3.23%
1896 4.27% 0.00%
1897 0.00% 4.04%
1898 1.43% 18.80%
1899 0.35% 1.77%
1900 11.37% 0.00%
1901 0.40% 0.00%
1902 0.00% 0.45%
1903 0.00% 0.00%
1904 0.00% 10.60%
1905 1.25% 17.44%
1906 7.57% 0.00%
1907 30.67% 14.09%
1908 0.76% 0.00%
1909 17.74% 2.79%
1910 0.00% 2.81%
1911 26.02% 0.52%
1912 0.00% 38.72%
1913 17.45% 9.62%
1914 24.24% 0.00%
1915 0.00% 1.96%
1916 15.76% 26.22%
1917 0.00% 18.37%
1918 0.10% 58.09%
1919 12.95% 10.08%
1920 0.90% 9.29%
1921 20.40% 0.00%
1922 0.00% 19.91%
1923 28.33% 0.34%
1924 0.00% 7.88%
1925 0.45% 6.73%
1926 0.23% 4.43%
1927 4.42% 0.00%
1928 0.25% 0.00%
1929 0.00% 27.26%
1930 0.00% 52.09%
1931 17.66% 0.08%
1932 30.66% 15.83%
1933 46.63% 7.35%
1934 22.17% 0.00%
1935 11.55% 1.10%
1936 0.00% 10.59%
1937 22.34% 55.56%
1938 0.56% 0.00%
1939 10.07% 0.00%
1940 0.00% 52.83%
1941 0.00% 0.00%
1942 2.95% 0.58%
1943 0.00% 2.59%
1944 13.26% 1.01%
1945 0.19% 5.10%
1946 0.00% 0.48%
1947 3.81% 0.63%
1948 2.34% 15.96%
1949 19.78% 47.78%
1950 34.31% 21.27%
1951 0.00% 0.00%
1952 25.52% 0.19%
1953 49.47% 0.00%
1954 4.73% 1.20%
1955 0.00% 7.95%
1956 13.13% 0.84%
1957 3.36% 17.83%
1958 7.90% 1.54%
1959 0.35% 0.95%
1960 0.00% 3.47%
1961 1.61% 3.09%
1962 0.00% 7.93%
1963 0.00% 42.42%
1964 2.58% 2.19%
1965 6.48% 0.00%
1966 0.00% 12.57%
1967 3.38% 0.00%
1968 0.00% 2.60%
1969 11.78% 7.85%
1970 0.00% 19.88%
1971 1.44% 2.49%
1972 2.15% 1.44%