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 15.90%
1911 3.30%
1912 10.00%
1913 6.30%
1914 21.40%
1915 2.90%
1916 17.20%
1917 6.00%
1918 16.70%
1919 2.60%
1920 5.40%
1921 7.90%
1922 16.30%
1923 10.60%
1924 0.00%
1925 10.30%
1926 2.70%
1927 8.80%
1928 5.50%
1929 10.70%
1930 2.80%
1931 2.70%
1932 5.30%
1933 5.60%
1934 13.80%
1935 2.70%
1936 10.40%
1937 10.60%
1938 8.20%
1939 8.10%
1940 5.30%
1941 2.70%
1942 16.10%
1943 8.10%
1944 2.50%
1945 5.80%
1946 0.00%
1947 10.90%
1948 10.90%
1949 0.00%
1950 5.20%
1951 2.70%
1952 2.50%
1953 7.90%
1954 10.60%
1955 10.60%
1956 5.20%
1957 10.30%
1958 0.00%
1959 2.60%
1960 8.20%
1961 5.20%
1962 2.50%
1963 2.70%
1964 4.90%
1965 2.50%
1966 13.20%
1967 10.50%
1968 2.80%
1969 0.00%
1970 8.00%
1971 5.10%
1972 13.70%
1973 5.10%
1974 8.40%
1975 2.60%
1976 0.00%
1977 2.60%
1978 8.50%
1979 0.00%
1980 0.00%
1981 2.50%
1982 0.00%
1983 2.80%
1984 11.00%
1985 8.10%
1986 0.00%
1987 2.70%
1988 18.50%
1989 11.20%
1990 0.00%
1991 13.70%
1992 2.60%
1993 0.00%
1994 2.80%
1995 2.60%
1996 8.50%
1997 9.00%
1998 8.10%
1999 14.20%
2000 19.30%
2001 11.00%
2002 2.60%
2003 5.50%
2004 17.40%
2005 11.70%
2006 2.80%
2007 2.70%
2008 15.30%
2009 12.30%
2010 16.40%
2011 8.70%
2012 14.00%
2013 7.50%

*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.