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 11.98%
1911 28.44%
1912 34.90%
1913 7.58%
1914 15.20%
1915 21.16%
1916 11.30%
1917 27.02%
1918 7.28%
1919 13.88%
1920 22.44%
1921 35.82%
1922 22.26%
1923 7.38%
1924 20.76%
1925 26.64%
1926 15.96%
1927 34.78%
1928 18.86%
1929 30.58%
1930 14.36%
1931 21.78%
1932 25.60%
1933 29.34%
1934 8.22%
1935 5.52%
1936 16.42%
1937 10.68%
1938 16.04%
1939 10.28%
1940 36.24%
1941 19.56%
1942 6.50%
1943 22.40%
1944 8.60%
1945 6.88%
1946 17.12%
1947 16.78%
1948 21.80%
1949 25.26%
1950 8.46%
1951 11.00%
1952 7.14%
1953 19.94%
1954 35.54%
1955 18.26%
1956 13.02%
1957 14.32%
1958 38.20%
1959 15.60%
1960 26.48%
1961 15.14%
1962 10.36%
1963 27.46%
1964 32.28%
1965 12.12%
1966 31.18%
1967 15.20%
1968 27.96%
1969 34.62%
1970 6.34%
1971 12.98%
1972 15.66%
1973 14.32%
1974 9.38%
1975 29.00%
1976 36.86%
1977 6.72%
1978 16.08%
1979 33.88%
1980 4.90%
1981 25.76%
1982 13.18%
1983 29.04%
1984 12.32%
1985 12.70%
1986 21.94%
1987 4.44%
1988 18.84%
1989 25.08%
1990 48.12%
1991 34.82%
1992 22.38%
1993 5.44%
1994 14.92%
1995 14.88%
1996 18.50%
1997 11.42%
1998 47.18%
1999 28.64%
2000 17.50%
2001 14.74%
2002 25.54%
2003 24.92%
2004 19.68%
2005 9.84%
2006 28.08%
2007 49.84%
2008 14.30%
2009 16.10%
2010 17.06%
2011 35.48%
2012 39.00%
2013 40.76%

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.