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
1910 21.84%
1911 28.62%
1912 32.28%
1913 17.98%
1914 11.06%
1915 27.26%
1916 50.96%
1917 35.70%
1918 9.12%
1919 16.02%
1920 15.04%
1921 18.98%
1922 17.18%
1923 20.62%
1924 31.48%
1925 13.52%
1926 11.10%
1927 32.46%
1928 18.62%
1929 29.34%
1930 8.78%
1931 41.66%
1932 7.54%
1933 17.52%
1934 60.78%
1935 12.64%
1936 22.52%
1937 26.66%
1938 13.52%
1939 28.76%
1940 18.12%
1941 20.54%
1942 16.20%
1943 7.66%
1944 18.52%
1945 9.56%
1946 15.28%
1947 11.70%
1948 11.76%
1949 8.42%
1950 32.34%
1951 43.90%
1952 13.38%
1953 19.58%
1954 20.12%
1955 23.54%
1956 10.28%
1957 10.16%
1958 8.02%
1959 3.40%
1960 10.92%
1961 14.76%
1962 3.72%
1963 7.86%
1964 14.60%
1965 15.00%
1966 8.70%
1967 7.72%
1968 14.88%
1969 9.20%
1970 8.44%
1971 12.02%
1972 13.14%
1973 14.86%
1974 5.86%
1975 16.36%
1976 15.98%
1977 10.06%
1978 30.32%
1979 14.70%
1980 10.90%
1981 31.68%
1982 24.48%
1983 17.32%
1984 16.42%
1985 21.46%
1986 18.70%
1987 37.86%
1988 34.04%
1989 15.84%
1990 18.10%
1991 13.96%
1992 13.94%
1993 41.86%
1994 18.40%
1995 21.18%
1996 33.18%
1997 15.14%
1998 38.82%
1999 37.20%
2000 13.76%
2001 33.10%
2002 12.64%
2003 15.82%
2004 16.74%
2005 26.48%
2006 36.24%
2007 40.90%
2008 17.98%
2009 17.00%
2010 30.76%
2011 23.66%
2012 48.02%
2013 24.50%

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.