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 10.30%
1912 0.00%
1913 0.00%
1914 0.00%
1915 0.00%
1916 0.00%
1917 0.00%
1918 11.70%
1919 19.50%
1920 12.30%
1921 0.00%
1922 9.10%
1923 0.00%
1924 0.00%
1925 9.90%
1926 60.10%
1927 9.00%
1928 29.20%
1929 10.50%
1930 20.00%
1931 26.60%
1932 0.00%
1933 0.00%
1934 0.00%
1935 9.20%
1936 10.30%
1937 9.10%
1938 27.20%
1939 9.20%
1940 18.10%
1941 9.40%
1942 0.00%
1943 0.00%
1944 0.00%
1945 0.00%
1946 0.00%
1947 0.00%
1948 9.10%
1949 9.00%
1950 9.40%
1951 9.00%
1952 9.20%
1953 0.00%
1954 0.00%
1955 0.00%
1956 0.00%
1957 9.50%
1958 26.80%
1959 0.00%
1960 0.00%
1961 0.00%
1962 9.00%
1963 0.00%
1964 9.00%
1965 0.00%
1966 9.10%
1967 9.00%
1968 9.00%
1969 0.00%
1970 37.20%
1971 0.00%
1972 0.00%
1973 0.00%
1974 8.60%
1975 17.80%
1976 9.10%
1977 0.00%
1978 0.00%
1979 0.00%
1980 0.00%
1981 0.00%
1982 17.60%
1983 9.00%
1984 0.00%
1985 10.90%
1986 30.10%
1987 9.00%
1988 18.00%
1989 0.00%
1990 9.00%
1991 20.50%
1992 9.00%
1993 9.60%
1994 0.00%
1995 27.10%
1996 10.20%
1997 0.00%
1998 0.00%
1999 0.00%
2000 0.00%
2001 9.00%
2002 0.00%
2003 20.10%
2004 0.00%
2005 11.20%
2006 0.00%
2007 0.00%
2008 0.00%
2009 18.00%
2010 0.00%
2011 19.70%
2012 24.20%
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.