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 15.90%
1911 14.40%
1912 17.80%
1913 7.00%
1914 20.70%
1915 27.20%
1916 24.20%
1917 14.40%
1918 10.90%
1919 18.80%
1920 21.20%
1921 5.40%
1922 6.20%
1923 9.80%
1924 14.10%
1925 16.90%
1926 6.90%
1927 26.90%
1928 19.80%
1929 23.50%
1930 17.30%
1931 36.50%
1932 11.90%
1933 7.20%
1934 54.00%
1935 24.30%
1936 26.50%
1937 23.70%
1938 9.80%
1939 16.40%
1940 18.30%
1941 46.80%
1942 29.20%
1943 8.30%
1944 11.90%
1945 13.10%
1946 10.40%
1947 12.00%
1948 19.20%
1949 7.50%
1950 18.10%
1951 28.00%
1952 17.90%
1953 22.70%
1954 44.50%
1955 27.00%
1956 41.00%
1957 8.60%
1958 19.90%
1959 12.70%
1960 16.40%
1961 16.00%
1962 3.40%
1963 23.30%
1964 23.30%
1965 23.30%
1966 12.50%
1967 2.40%
1968 8.40%
1969 6.20%
1970 3.50%
1971 15.90%
1972 12.60%
1973 34.10%
1974 21.00%
1975 26.70%
1976 13.80%
1977 12.80%
1978 14.90%
1979 27.10%
1980 9.70%
1981 12.60%
1982 17.50%
1983 41.00%
1984 24.80%
1985 22.30%
1986 16.90%
1987 20.30%
1988 23.10%
1989 29.10%
1990 25.20%
1991 14.30%
1992 27.50%
1993 26.20%
1994 14.90%
1995 18.40%
1996 34.20%
1997 30.60%
1998 21.70%
1999 17.00%
2000 24.50%
2001 24.00%
2002 29.40%
2003 30.70%
2004 16.40%
2005 15.10%
2006 19.50%
2007 32.90%
2008 24.20%
2009 23.70%
2010 16.40%
2011 43.90%
2012 35.10%
2013 33.00%

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.