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 27.40%
1912 16.00%
1913 7.00%
1914 16.30%
1915 22.10%
1916 30.90%
1917 19.50%
1918 21.50%
1919 15.80%
1920 25.20%
1921 7.90%
1922 3.50%
1923 5.80%
1924 17.70%
1925 16.80%
1926 9.80%
1927 21.50%
1928 18.60%
1929 29.20%
1930 10.50%
1931 36.60%
1932 12.10%
1933 3.80%
1934 44.20%
1935 27.30%
1936 17.80%
1937 21.80%
1938 8.10%
1939 11.10%
1940 24.10%
1941 38.30%
1942 34.80%
1943 14.70%
1944 8.80%
1945 9.90%
1946 11.50%
1947 9.80%
1948 14.90%
1949 9.10%
1950 14.80%
1951 20.90%
1952 19.80%
1953 15.90%
1954 33.90%
1955 31.60%
1956 38.00%
1957 11.20%
1958 24.10%
1959 10.20%
1960 15.30%
1961 20.00%
1962 4.90%
1963 11.90%
1964 22.80%
1965 18.70%
1966 14.30%
1967 4.90%
1968 6.60%
1969 11.10%
1970 2.30%
1971 12.00%
1972 14.00%
1973 47.50%
1974 22.20%
1975 24.10%
1976 15.80%
1977 27.50%
1978 14.90%
1979 24.80%
1980 13.40%
1981 16.30%
1982 12.90%
1983 41.00%
1984 33.70%
1985 22.60%
1986 12.60%
1987 16.30%
1988 21.60%
1989 19.20%
1990 21.50%
1991 10.60%
1992 29.10%
1993 29.10%
1994 17.70%
1995 19.80%
1996 35.50%
1997 31.70%
1998 21.20%
1999 23.60%
2000 22.80%
2001 20.40%
2002 30.80%
2003 23.70%
2004 22.00%
2005 20.60%
2006 23.60%
2007 28.90%
2008 24.20%
2009 20.70%
2010 16.50%
2011 53.80%
2012 19.60%
2013 31.40%
2014 27.00%

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.