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 11.60%
1911 28.60%
1912 64.90%
1913 24.30%
1914 5.80%
1915 38.70%
1916 18.40%
1917 48.10%
1918 4.60%
1919 20.80%
1920 30.80%
1921 38.80%
1922 16.60%
1923 9.60%
1924 35.00%
1925 30.00%
1926 27.70%
1927 11.90%
1928 4.60%
1929 18.30%
1930 11.10%
1931 32.70%
1932 17.40%
1933 27.70%
1934 64.50%
1935 1.50%
1936 8.70%
1937 12.90%
1938 14.50%
1939 8.50%
1940 49.70%
1941 17.90%
1942 6.00%
1943 15.00%
1944 17.60%
1945 3.50%
1946 13.90%
1947 5.30%
1948 9.00%
1949 29.60%
1950 24.50%
1951 17.00%
1952 21.10%
1953 20.70%
1954 37.00%
1955 24.70%
1956 7.90%
1957 5.60%
1958 42.10%
1959 4.90%
1960 27.80%
1961 16.60%
1962 3.60%
1963 4.50%
1964 12.40%
1965 15.90%
1966 11.60%
1967 2.40%
1968 10.50%
1969 7.40%
1970 3.90%
1971 4.70%
1972 7.60%
1973 20.50%
1974 3.00%
1975 28.40%
1976 8.40%
1977 0.80%
1978 42.60%
1979 58.30%
1980 2.20%
1981 18.70%
1982 21.50%
1983 17.70%
1984 11.30%
1985 2.00%
1986 20.50%
1987 27.40%
1988 21.50%
1989 7.90%
1990 14.90%
1991 18.10%
1992 22.40%
1993 30.50%
1994 23.30%
1995 0.50%
1996 19.90%
1997 6.60%
1998 24.00%
1999 14.90%
2000 51.00%
2001 5.00%
2002 27.50%
2003 28.50%
2004 8.20%
2005 6.20%
2006 66.70%
2007 31.50%
2008 5.60%
2009 11.90%
2010 12.70%
2011 28.10%
2012 82.60%
2013 13.60%
2014 37.40%

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.