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 13.20%
1911 18.00%
1912 17.70%
1913 7.60%
1914 21.70%
1915 25.80%
1916 25.80%
1917 15.60%
1918 14.20%
1919 18.00%
1920 19.80%
1921 5.30%
1922 6.10%
1923 8.70%
1924 14.60%
1925 18.10%
1926 7.90%
1927 27.70%
1928 20.70%
1929 23.00%
1930 14.80%
1931 40.20%
1932 12.80%
1933 5.80%
1934 52.80%
1935 25.70%
1936 26.50%
1937 24.10%
1938 9.40%
1939 14.40%
1940 18.40%
1941 42.80%
1942 28.60%
1943 9.30%
1944 11.60%
1945 12.70%
1946 11.40%
1947 11.00%
1948 17.60%
1949 8.80%
1950 16.80%
1951 27.20%
1952 19.80%
1953 19.80%
1954 43.20%
1955 25.70%
1956 40.70%
1957 8.80%
1958 20.80%
1959 10.80%
1960 14.50%
1961 14.20%
1962 3.60%
1963 20.20%
1964 24.30%
1965 22.50%
1966 13.60%
1967 1.90%
1968 7.60%
1969 7.10%
1970 2.50%
1971 13.20%
1972 10.80%
1973 35.40%
1974 20.80%
1975 25.80%
1976 13.00%
1977 15.80%
1978 15.00%
1979 27.00%
1980 10.50%
1981 15.30%
1982 16.70%
1983 40.60%
1984 27.00%
1985 21.70%
1986 16.00%
1987 19.90%
1988 23.50%
1989 27.80%
1990 22.20%
1991 11.70%
1992 26.20%
1993 28.30%
1994 16.50%
1995 19.10%
1996 32.90%
1997 31.60%
1998 21.20%
1999 18.60%
2000 22.10%
2001 21.50%
2002 31.70%
2003 30.30%
2004 15.60%
2005 17.00%
2006 19.80%
2007 30.20%
2008 23.40%
2009 22.30%
2010 15.00%
2011 44.90%
2012 32.40%
2013 28.60%
2014 26.90%

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.