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 10.40%
1911 20.90%
1912 18.30%
1913 7.10%
1914 21.20%
1915 25.30%
1916 25.40%
1917 16.00%
1918 19.10%
1919 18.90%
1920 21.10%
1921 5.40%
1922 5.60%
1923 8.50%
1924 15.30%
1925 16.50%
1926 8.70%
1927 22.20%
1928 20.60%
1929 21.00%
1930 12.70%
1931 39.70%
1932 13.90%
1933 4.80%
1934 55.60%
1935 26.20%
1936 25.80%
1937 24.30%
1938 8.10%
1939 14.20%
1940 21.90%
1941 40.30%
1942 28.40%
1943 11.70%
1944 11.20%
1945 11.20%
1946 10.90%
1947 9.70%
1948 18.60%
1949 9.10%
1950 16.30%
1951 22.70%
1952 17.70%
1953 18.20%
1954 43.00%
1955 28.30%
1956 42.30%
1957 9.10%
1958 22.30%
1959 9.30%
1960 15.60%
1961 14.50%
1962 4.10%
1963 18.50%
1964 24.40%
1965 20.70%
1966 14.70%
1967 3.00%
1968 6.40%
1969 6.40%
1970 2.50%
1971 11.70%
1972 11.40%
1973 36.80%
1974 22.00%
1975 27.60%
1976 14.80%
1977 18.40%
1978 16.60%
1979 27.50%
1980 13.10%
1981 16.00%
1982 14.20%
1983 40.40%
1984 27.50%
1985 19.90%
1986 17.50%
1987 16.70%
1988 25.80%
1989 24.80%
1990 20.50%
1991 8.60%
1992 27.90%
1993 29.60%
1994 17.20%
1995 20.70%
1996 30.80%
1997 29.20%
1998 21.50%
1999 20.40%
2000 24.70%
2001 22.20%
2002 32.90%
2003 30.20%
2004 15.20%
2005 15.60%
2006 19.80%
2007 29.30%
2008 23.70%
2009 22.20%
2010 15.10%
2011 49.80%
2012 28.40%
2013 29.50%
2014 27.60%

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.