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 10.20%
1911 25.60%
1912 7.10%
1913 14.70%
1914 12.10%
1915 20.90%
1916 34.80%
1917 17.90%
1918 20.70%
1919 6.40%
1920 22.80%
1921 7.90%
1922 6.80%
1923 5.10%
1924 18.10%
1925 14.40%
1926 7.60%
1927 13.10%
1928 19.20%
1929 28.00%
1930 10.70%
1931 36.40%
1932 22.10%
1933 4.50%
1934 27.30%
1935 38.80%
1936 9.00%
1937 25.50%
1938 13.50%
1939 10.20%
1940 28.70%
1941 25.40%
1942 36.20%
1943 15.10%
1944 8.80%
1945 10.20%
1946 12.30%
1947 13.20%
1948 17.20%
1949 11.90%
1950 13.10%
1951 25.50%
1952 32.00%
1953 14.50%
1954 32.30%
1955 38.40%
1956 35.80%
1957 25.30%
1958 20.30%
1959 6.50%
1960 16.10%
1961 19.20%
1962 11.10%
1963 9.70%
1964 28.30%
1965 23.40%
1966 16.60%
1967 6.70%
1968 3.20%
1969 13.70%
1970 5.00%
1971 7.90%
1972 12.40%
1973 30.60%
1974 29.70%
1975 23.00%
1976 19.70%
1977 31.80%
1978 9.50%
1979 24.30%
1980 15.90%
1981 21.10%
1982 12.30%
1983 37.00%
1984 25.60%
1985 22.40%
1986 12.60%
1987 23.90%
1988 18.20%
1989 16.20%
1990 31.20%
1991 20.90%
1992 21.20%
1993 34.20%
1994 23.30%
1995 12.00%
1996 33.40%
1997 34.30%
1998 27.40%
1999 16.60%
2000 25.70%
2001 20.70%
2002 29.30%
2003 28.40%
2004 21.50%
2005 28.60%
2006 27.50%
2007 21.40%
2008 21.40%
2009 25.10%
2010 19.90%
2011 25.80%
2012 18.20%
2013 32.10%
2014 21.20%

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.