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.

Download: xml csv json
January Very Wet: Very Dry:
1895 25.34% 0.00%
1896 9.91% 4.75%
1897 20.37% 2.61%
1898 16.03% 11.39%
1899 8.48% 4.34%
1900 2.94% 17.42%
1901 1.45% 7.07%
1902 0.09% 18.56%
1903 6.29% 7.90%
1904 3.93% 10.89%
1905 9.05% 1.64%
1906 9.41% 1.33%
1907 34.35% 11.41%
1908 0.10% 6.43%
1909 21.94% 15.79%
1910 6.73% 2.01%
1911 14.28% 10.06%
1912 3.70% 20.94%
1913 13.84% 0.97%
1914 19.71% 18.43%
1915 14.75% 0.82%
1916 51.52% 2.53%
1917 6.02% 0.66%
1918 11.86% 5.22%
1919 1.67% 31.62%
1920 7.80% 11.57%
1921 3.48% 5.50%
1922 3.46% 1.89%
1923 1.87% 6.37%
1924 1.29% 14.62%
1925 8.46% 15.00%
1926 9.92% 1.34%
1927 0.78% 17.25%
1928 1.93% 30.64%
1929 10.60% 4.66%
1930 10.72% 1.69%
1931 4.27% 27.24%
1932 26.52% 0.00%
1933 4.80% 6.72%
1934 1.94% 9.84%
1935 7.18% 6.35%
1936 22.23% 4.93%
1937 32.35% 1.36%
1938 6.38% 3.03%
1939 12.96% 0.16%
1940 9.17% 7.48%
1941 7.76% 6.54%
1942 0.00% 13.36%
1943 14.44% 11.25%
1944 12.87% 12.00%
1945 2.35% 6.34%
1946 12.02% 6.43%
1947 11.73% 8.89%
1948 3.92% 13.57%
1949 52.29% 11.78%
1950 26.54% 7.82%
1951 2.24% 9.07%
1952 10.70% 3.17%
1953 8.62% 6.21%
1954 8.24% 9.23%
1955 1.59% 10.18%
1956 12.57% 7.85%
1957 8.56% 7.22%
1958 9.77% 4.42%
1959 3.30% 10.92%
1960 9.66% 0.45%
1961 2.57% 38.90%
1962 3.07% 3.62%
1963 1.05% 16.66%
1964 5.53% 7.95%
1965 8.80% 2.76%
1966 2.89% 8.46%
1967 8.41% 15.61%
1968 7.77% 5.96%
1969 32.81% 8.54%
1970 10.42% 25.37%
1971 8.43% 13.82%
1972 7.82% 13.28%
1973 5.52% 5.16%
1974 18.63% 4.13%
1975 14.19% 2.96%
1976 1.18% 25.80%
1977 0.78% 8.08%
1978 25.32% 0.00%