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 0.00%
1911 11.00%
1912 11.00%
1913 0.00%
1914 0.00%
1915 0.00%
1916 0.00%
1917 14.30%
1918 0.00%
1919 0.00%
1920 12.30%
1921 12.60%
1922 0.00%
1923 0.00%
1924 0.00%
1925 0.00%
1926 0.00%
1927 0.00%
1928 0.00%
1929 0.00%
1930 0.00%
1931 0.00%
1932 0.00%
1933 0.00%
1934 0.00%
1935 0.00%
1936 0.00%
1937 9.90%
1938 0.00%
1939 0.00%
1940 0.00%
1941 0.00%
1942 10.50%
1943 9.90%
1944 0.00%
1945 10.00%
1946 0.00%
1947 9.40%
1948 0.00%
1949 19.30%
1950 10.00%
1951 0.00%
1952 0.00%
1953 0.00%
1954 9.90%
1955 0.00%
1956 0.00%
1957 0.00%
1958 0.00%
1959 0.00%
1960 0.00%
1961 0.00%
1962 0.00%
1963 0.00%
1964 0.00%
1965 10.00%
1966 0.00%
1967 0.00%
1968 0.00%
1969 0.00%
1970 10.20%
1971 0.00%
1972 11.40%
1973 0.00%
1974 21.90%
1975 0.00%
1976 0.00%
1977 9.90%
1978 0.00%
1979 0.00%
1980 0.00%
1981 0.00%
1982 0.00%
1983 10.20%
1984 0.00%
1985 0.00%
1986 19.50%
1987 0.00%
1988 0.00%
1989 0.00%
1990 0.00%
1991 0.00%
1992 0.00%
1993 20.40%
1994 0.00%
1995 0.00%
1996 0.00%
1997 0.00%
1998 0.00%
1999 0.00%
2000 21.50%
2001 11.10%
2002 0.00%
2003 11.10%
2004 0.00%
2005 0.00%
2006 0.00%
2007 0.00%
2008 0.00%
2009 11.00%
2010 10.50%
2011 0.00%
2012 24.80%
2013 0.00%
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.