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 25.90%
1912 34.60%
1913 26.36%
1914 15.48%
1915 21.22%
1916 21.06%
1917 32.78%
1918 32.04%
1919 17.16%
1920 29.92%
1921 23.58%
1922 18.30%
1923 12.26%
1924 15.38%
1925 18.44%
1926 17.78%
1927 14.18%
1928 14.28%
1929 18.94%
1930 14.56%
1931 25.92%
1932 30.72%
1933 14.96%
1934 33.70%
1935 25.34%
1936 21.84%
1937 25.50%
1938 14.34%
1939 13.62%
1940 22.48%
1941 16.34%
1942 22.68%
1943 12.32%
1944 9.44%
1945 8.68%
1946 9.90%
1947 9.20%
1948 14.28%
1949 29.18%
1950 20.86%
1951 19.68%
1952 20.36%
1953 13.58%
1954 24.96%
1955 15.76%
1956 19.58%
1957 14.40%
1958 22.70%
1959 11.96%
1960 20.94%
1961 12.50%
1962 11.90%
1963 12.60%
1964 17.46%
1965 14.80%
1966 12.26%
1967 13.38%
1968 9.40%
1969 16.26%
1970 17.26%
1971 9.40%
1972 12.00%
1973 28.26%
1974 24.48%
1975 9.78%
1976 17.22%
1977 34.86%
1978 32.04%
1979 27.96%
1980 12.10%
1981 28.16%
1982 12.94%
1983 30.06%
1984 20.66%
1985 21.04%
1986 14.38%
1987 19.06%
1988 12.16%
1989 9.74%
1990 15.96%
1991 17.78%
1992 24.64%
1993 20.52%
1994 12.58%
1995 21.78%
1996 30.32%
1997 21.70%
1998 25.68%
1999 36.30%
2000 37.76%
2001 16.66%
2002 26.90%
2003 20.58%
2004 17.58%
2005 28.44%
2006 28.34%
2007 18.14%
2008 19.40%
2009 19.34%
2010 24.26%
2011 18.12%
2012 38.14%
2013 15.82%
2014 23.22%

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.