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 8.30%
1911 27.20%
1912 13.10%
1913 7.70%
1914 15.70%
1915 18.80%
1916 37.10%
1917 21.00%
1918 20.20%
1919 10.80%
1920 24.50%
1921 7.30%
1922 4.50%
1923 5.10%
1924 17.30%
1925 16.10%
1926 10.90%
1927 18.80%
1928 17.40%
1929 27.10%
1930 9.30%
1931 38.70%
1932 11.40%
1933 4.10%
1934 38.30%
1935 29.30%
1936 14.70%
1937 21.60%
1938 8.90%
1939 11.40%
1940 22.20%
1941 35.20%
1942 38.50%
1943 14.70%
1944 8.10%
1945 9.60%
1946 11.40%
1947 12.00%
1948 15.40%
1949 9.30%
1950 15.40%
1951 20.90%
1952 20.40%
1953 15.20%
1954 32.30%
1955 35.30%
1956 37.30%
1957 10.00%
1958 24.20%
1959 8.20%
1960 15.80%
1961 18.30%
1962 5.90%
1963 12.60%
1964 21.30%
1965 18.60%
1966 15.60%
1967 5.60%
1968 7.70%
1969 11.50%
1970 2.70%
1971 9.70%
1972 12.20%
1973 43.60%
1974 25.50%
1975 24.60%
1976 16.90%
1977 30.10%
1978 12.80%
1979 27.00%
1980 16.10%
1981 18.60%
1982 12.50%
1983 43.50%
1984 32.30%
1985 23.90%
1986 12.70%
1987 16.30%
1988 19.80%
1989 16.90%
1990 29.10%
1991 13.00%
1992 27.80%
1993 29.60%
1994 18.20%
1995 16.80%
1996 35.60%
1997 34.40%
1998 19.20%
1999 22.40%
2000 22.50%
2001 22.90%
2002 33.60%
2003 22.50%
2004 24.50%
2005 24.20%
2006 24.10%
2007 27.70%
2008 23.20%
2009 21.20%
2010 16.50%
2011 51.00%
2012 19.60%
2013 30.90%
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.