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 20.08%
1911 25.56%
1912 31.06%
1913 26.00%
1914 14.08%
1915 17.94%
1916 26.70%
1917 25.40%
1918 15.56%
1919 16.00%
1920 19.04%
1921 27.92%
1922 21.40%
1923 11.74%
1924 17.74%
1925 18.00%
1926 11.68%
1927 13.68%
1928 11.68%
1929 25.32%
1930 9.12%
1931 20.82%
1932 17.82%
1933 13.90%
1934 27.88%
1935 20.50%
1936 22.74%
1937 33.58%
1938 23.46%
1939 10.22%
1940 28.44%
1941 19.16%
1942 15.38%
1943 12.40%
1944 8.22%
1945 11.28%
1946 19.48%
1947 11.74%
1948 18.62%
1949 33.42%
1950 24.66%
1951 11.38%
1952 18.26%
1953 21.46%
1954 17.42%
1955 18.88%
1956 12.66%
1957 14.56%
1958 25.50%
1959 9.08%
1960 21.20%
1961 13.98%
1962 10.20%
1963 13.80%
1964 18.40%
1965 13.22%
1966 12.40%
1967 11.40%
1968 13.66%
1969 17.26%
1970 14.92%
1971 10.78%
1972 14.50%
1973 23.58%
1974 18.56%
1975 12.14%
1976 14.90%
1977 18.66%
1978 34.88%
1979 34.68%
1980 14.64%
1981 23.66%
1982 12.54%
1983 31.14%
1984 14.58%
1985 15.02%
1986 27.76%
1987 19.76%
1988 11.46%
1989 10.08%
1990 31.94%
1991 11.02%
1992 28.64%
1993 19.56%
1994 15.30%
1995 17.06%
1996 19.88%
1997 16.82%
1998 32.04%
1999 22.90%
2000 34.10%
2001 10.92%
2002 19.34%
2003 19.02%
2004 13.84%
2005 22.10%
2006 27.10%
2007 16.58%
2008 12.36%
2009 17.08%
2010 22.48%
2011 13.50%
2012 39.54%
2013 14.88%
2014 29.10%

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.