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 21.70%
1911 13.70%
1912 20.40%
1913 10.20%
1914 9.40%
1915 0.00%
1916 4.90%
1917 0.00%
1918 9.50%
1919 9.70%
1920 5.10%
1921 4.90%
1922 15.20%
1923 9.80%
1924 0.00%
1925 9.50%
1926 19.80%
1927 23.40%
1928 0.00%
1929 4.90%
1930 5.50%
1931 25.00%
1932 0.00%
1933 13.60%
1934 17.90%
1935 9.20%
1936 18.00%
1937 9.20%
1938 4.80%
1939 0.00%
1940 4.60%
1941 5.20%
1942 4.40%
1943 0.00%
1944 0.00%
1945 9.10%
1946 4.80%
1947 9.00%
1948 0.00%
1949 4.70%
1950 14.10%
1951 20.00%
1952 0.00%
1953 0.00%
1954 0.00%
1955 0.00%
1956 13.20%
1957 4.90%
1958 9.70%
1959 4.50%
1960 13.60%
1961 4.40%
1962 0.00%
1963 4.50%
1964 0.00%
1965 4.80%
1966 4.60%
1967 23.80%
1968 4.70%
1969 13.70%
1970 4.50%
1971 4.40%
1972 13.70%
1973 0.00%
1974 9.30%
1975 4.40%
1976 4.60%
1977 22.80%
1978 0.00%
1979 4.80%
1980 4.60%
1981 4.60%
1982 4.50%
1983 8.90%
1984 13.60%
1985 20.30%
1986 4.50%
1987 14.70%
1988 9.20%
1989 4.50%
1990 0.00%
1991 13.30%
1992 23.50%
1993 9.80%
1994 0.00%
1995 5.00%
1996 5.00%
1997 4.80%
1998 5.30%
1999 0.00%
2000 9.30%
2001 4.60%
2002 9.80%
2003 5.00%
2004 13.80%
2005 0.00%
2006 0.00%
2007 0.00%
2008 0.00%
2009 0.00%
2010 15.00%
2011 6.30%
2012 0.00%
2013 11.80%
2014 0.00%

*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.