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 9.10%
1911 24.10%
1912 18.20%
1913 6.80%
1914 19.50%
1915 23.70%
1916 24.90%
1917 16.30%
1918 21.70%
1919 18.20%
1920 24.00%
1921 5.80%
1922 5.60%
1923 6.20%
1924 17.50%
1925 16.80%
1926 9.30%
1927 19.70%
1928 21.30%
1929 21.90%
1930 11.60%
1931 38.00%
1932 14.40%
1933 4.50%
1934 52.00%
1935 26.10%
1936 24.40%
1937 23.70%
1938 8.10%
1939 12.40%
1940 21.80%
1941 39.40%
1942 30.30%
1943 11.90%
1944 11.00%
1945 12.20%
1946 10.70%
1947 8.50%
1948 17.90%
1949 8.70%
1950 16.10%
1951 21.70%
1952 19.00%
1953 17.10%
1954 39.10%
1955 27.70%
1956 38.40%
1957 9.70%
1958 21.80%
1959 8.10%
1960 14.90%
1961 16.20%
1962 4.40%
1963 16.10%
1964 23.70%
1965 20.20%
1966 14.20%
1967 3.30%
1968 6.20%
1969 7.90%
1970 3.00%
1971 11.20%
1972 11.60%
1973 38.30%
1974 21.60%
1975 25.90%
1976 15.40%
1977 21.60%
1978 18.30%
1979 28.30%
1980 14.00%
1981 16.80%
1982 14.80%
1983 39.30%
1984 28.10%
1985 21.50%
1986 16.50%
1987 15.30%
1988 26.90%
1989 21.30%
1990 19.90%
1991 9.20%
1992 28.10%
1993 29.00%
1994 18.60%
1995 23.70%
1996 31.90%
1997 30.50%
1998 20.70%
1999 22.60%
2000 26.90%
2001 21.30%
2002 31.50%
2003 27.50%
2004 21.20%
2005 17.30%
2006 20.20%
2007 32.20%
2008 21.40%
2009 22.00%
2010 16.70%
2011 52.90%
2012 24.00%
2013 30.60%
2014 27.30%

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.