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 7.70%
1911 25.20%
1912 16.40%
1913 5.80%
1914 17.30%
1915 21.40%
1916 27.20%
1917 19.40%
1918 22.40%
1919 18.00%
1920 25.90%
1921 7.50%
1922 5.00%
1923 5.30%
1924 16.00%
1925 15.60%
1926 10.00%
1927 21.50%
1928 19.00%
1929 23.20%
1930 12.90%
1931 38.50%
1932 13.30%
1933 4.70%
1934 47.90%
1935 26.30%
1936 22.60%
1937 21.20%
1938 8.30%
1939 11.50%
1940 24.00%
1941 38.70%
1942 32.20%
1943 15.50%
1944 9.90%
1945 10.40%
1946 11.60%
1947 9.00%
1948 17.10%
1949 10.10%
1950 16.70%
1951 20.80%
1952 19.40%
1953 17.50%
1954 35.80%
1955 29.50%
1956 37.10%
1957 11.30%
1958 21.10%
1959 12.40%
1960 15.70%
1961 19.80%
1962 4.00%
1963 13.90%
1964 22.80%
1965 20.80%
1966 13.90%
1967 4.50%
1968 6.30%
1969 9.30%
1970 2.40%
1971 8.70%
1972 14.70%
1973 44.50%
1974 21.30%
1975 24.00%
1976 15.80%
1977 23.40%
1978 14.30%
1979 26.70%
1980 11.30%
1981 15.40%
1982 14.60%
1983 40.00%
1984 31.20%
1985 20.60%
1986 13.20%
1987 15.00%
1988 23.40%
1989 19.20%
1990 19.60%
1991 10.20%
1992 29.10%
1993 31.80%
1994 17.90%
1995 21.70%
1996 32.20%
1997 31.80%
1998 20.90%
1999 23.00%
2000 25.60%
2001 21.60%
2002 31.20%
2003 25.30%
2004 21.00%
2005 19.30%
2006 20.10%
2007 33.40%
2008 22.60%
2009 21.80%
2010 16.10%
2011 56.60%
2012 20.10%
2013 32.60%
2014 28.20%

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.