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 U.S. Climate Divisional Dataset. 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%
1899 0.38% 5.21%
1901 0.00% 22.47%
1903 0.00% 3.21%
1905 0.00% 4.43%
1907 0.00% 52.85%
1909 0.00% 27.59%
1911 0.74% 6.16%
1913 1.27% 4.08%
1915 47.88% 2.36%
1917 0.00% 21.84%
1919 0.00% 0.45%
1921 13.07% 0.47%
1923 0.00% 1.71%
1925 51.33% 0.45%
1927 15.18% 1.29%
1929 12.58% 11.48%
1931 1.97% 13.41%
1933 0.00% 9.66%
1935 0.00% 8.86%
1937 0.00% 0.00%
1939 7.43% 4.41%
1941 21.67% 10.87%
1943 31.98% 9.69%
1945 12.82% 17.14%
1947 5.76% 1.16%
1949 11.55% 5.05%
1951 0.17% 13.41%
1953 0.00% 24.06%
1955 48.46% 13.79%
1957 5.65% 4.93%
1959 6.06% 3.11%
1961 0.00% 35.20%
1963 16.74% 11.72%
1965 13.65% 1.45%
1967 27.60% 23.89%
1969 5.41% 0.00%
1971 0.00% 1.34%
1973 0.00% 30.73%
1975 0.00% 60.15%
1977 29.69% 0.00%
1979 0.00% 3.99%
1981 54.80% 0.00%
1983 0.00% 64.48%
1985 27.65% 0.00%
1987 43.27% 11.09%
1989 27.11% 0.00%
1991 20.08% 0.00%
1993 0.46% 18.52%
1995 0.24% 9.38%
1997 0.00% 51.55%
1999 16.37% 6.82%
2001 23.98% 0.00%
2003 1.40% 2.42%
2005 11.24% 2.67%
2007 0.00% 12.76%
2009 1.25% 0.00%
2011 27.55% 8.80%
2013 3.01% 23.21%