U.S. Climate Extremes Index (CEI)

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.

Graph

Choose a period/season and an indicator from the options below and click "Plot" to create a time series graph. Note that the sixth indicator (Step 6) is not calculated for the spring (March-May), winter (December-February) and cold (October-March) seasons since most months during these periods are outside of the traditional hurricane season.



Move mouse towards an axis until highlighted. Left-click mouse to pan. Shift key + left-click to zoom.

Year Percent
1911 20.60%
1912 24.26%
1913 17.50%
1914 15.34%
1915 20.74%
1916 22.08%
1917 25.50%
1918 33.08%
1919 17.10%
1920 26.84%
1921 19.30%
1922 17.72%
1923 15.52%
1924 14.00%
1925 11.26%
1926 13.94%
1927 15.38%
1928 12.18%
1929 27.32%
1930 9.40%
1931 26.96%
1932 34.68%
1933 23.80%
1934 30.84%
1935 16.28%
1936 31.30%
1937 34.94%
1938 13.00%
1939 9.06%
1940 23.22%
1941 16.78%
1942 16.76%
1943 12.86%
1944 13.60%
1945 7.56%
1946 7.48%
1947 8.78%
1948 13.60%
1949 36.64%
1950 27.88%
1951 12.62%
1952 21.42%
1953 18.84%
1954 24.96%
1955 15.50%
1956 15.94%
1957 20.26%
1958 20.26%
1959 16.26%
1960 11.78%
1961 16.84%
1962 10.94%
1963 22.76%
1964 23.36%
1965 14.70%
1966 13.78%
1967 10.66%
1968 8.30%
1969 18.04%
1970 17.86%
1971 10.60%
1972 11.04%
1973 16.78%
1974 15.40%
1975 11.34%
1976 16.50%
1977 31.18%
1978 36.42%
1979 40.46%
1980 12.82%
1981 28.64%
1982 14.36%
1983 30.40%
1984 20.12%
1985 17.18%
1986 15.34%
1987 20.90%
1988 9.18%
1989 10.38%
1990 13.66%
1991 15.48%
1992 31.24%
1993 23.16%
1994 13.64%
1995 18.74%
1996 20.24%
1997 18.18%
1998 30.62%
1999 31.86%
2000 29.94%
2001 13.58%
2002 27.46%
2003 22.56%
2004 10.28%
2005 24.98%
2006 24.42%
2007 15.98%
2008 14.52%
2009 15.74%
2010 24.44%
2011 15.82%
2012 32.00%
2013 17.50%
2014 24.80%

View CEI Data Files

Limitations: Statistics for the most recent period/season are computed from a fraction of the U.S. which has data available at that time. Extreme percentage values can and will likely change as final quality controlled data become available and fill in the data gaps.