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 19.70%
1911 11.70%
1912 11.00%
1913 14.10%
1914 10.20%
1915 7.10%
1916 9.30%
1917 5.90%
1918 5.80%
1919 14.50%
1920 3.70%
1921 15.80%
1922 0.00%
1923 18.10%
1924 12.30%
1925 6.00%
1926 3.30%
1927 3.40%
1928 6.30%
1929 27.80%
1930 9.40%
1931 2.90%
1932 9.30%
1933 2.90%
1934 3.00%
1935 9.20%
1936 6.40%
1937 9.60%
1938 6.30%
1939 3.10%
1940 9.70%
1941 5.90%
1942 0.00%
1943 16.30%
1944 12.70%
1945 3.20%
1946 6.00%
1947 12.60%
1948 6.40%
1949 12.30%
1950 12.50%
1951 12.90%
1952 6.10%
1953 9.60%
1954 6.10%
1955 12.20%
1956 0.00%
1957 3.00%
1958 6.60%
1959 6.00%
1960 9.40%
1961 0.00%
1962 3.00%
1963 5.90%
1964 12.30%
1965 5.90%
1966 9.00%
1967 9.30%
1968 9.50%
1969 3.20%
1970 12.40%
1971 9.30%
1972 3.20%
1973 6.40%
1974 5.90%
1975 3.20%
1976 6.20%
1977 3.00%
1978 6.70%
1979 10.20%
1980 16.80%
1981 3.20%
1982 16.10%
1983 3.00%
1984 15.20%
1985 9.40%
1986 6.20%
1987 12.40%
1988 7.00%
1989 6.10%
1990 9.00%
1991 5.70%
1992 6.40%
1993 9.10%
1994 15.70%
1995 9.00%
1996 3.10%
1997 12.60%
1998 15.70%
1999 6.30%
2000 6.00%
2001 6.50%
2002 3.40%
2003 6.40%
2004 3.10%
2005 6.40%
2006 24.30%
2007 30.10%
2008 28.90%
2009 0.00%
2010 3.40%
2011 14.60%
2012 11.20%
2013 4.60%
2014 11.00%

*As of September 2005, the fourth and fifth indicators are computed with data from one station per each grid box rather than multiple stations. This was done to eliminate many of the artificial extremes which resulted from a changing number of available stations over time. Therefore, the percentages in the step 4 and 5 graphs above will likely be significantly different from the percentages calculated prior to the changes implemented in September 2005.

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.