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 8.70%
1911 4.50%
1912 10.20%
1913 18.00%
1914 0.00%
1915 12.60%
1916 4.20%
1917 10.70%
1918 10.50%
1919 10.70%
1920 2.40%
1921 4.30%
1922 8.40%
1923 6.70%
1924 0.00%
1925 0.00%
1926 4.40%
1927 2.10%
1928 7.00%
1929 17.30%
1930 4.30%
1931 4.20%
1932 6.40%
1933 8.30%
1934 8.10%
1935 2.10%
1936 20.50%
1937 8.60%
1938 10.50%
1939 0.00%
1940 4.00%
1941 14.40%
1942 15.90%
1943 10.10%
1944 19.20%
1945 8.00%
1946 0.00%
1947 4.10%
1948 6.50%
1949 0.00%
1950 6.00%
1951 10.40%
1952 12.00%
1953 6.50%
1954 0.00%
1955 6.00%
1956 10.10%
1957 4.10%
1958 5.90%
1959 2.10%
1960 14.60%
1961 16.60%
1962 4.10%
1963 12.10%
1964 35.70%
1965 0.00%
1966 6.00%
1967 6.10%
1968 0.00%
1969 21.40%
1970 8.30%
1971 15.10%
1972 4.10%
1973 18.00%
1974 4.30%
1975 8.20%
1976 10.70%
1977 13.90%
1978 14.90%
1979 20.90%
1980 20.80%
1981 6.30%
1982 6.60%
1983 16.00%
1984 18.20%
1985 3.90%
1986 12.30%
1987 10.00%
1988 6.30%
1989 6.10%
1990 10.70%
1991 8.10%
1992 4.20%
1993 14.20%
1994 22.50%
1995 6.30%
1996 12.40%
1997 4.10%
1998 26.00%
1999 0.00%
2000 9.90%
2001 14.60%
2002 8.10%
2003 19.00%
2004 8.60%
2005 11.30%
2006 10.80%
2007 24.90%
2008 4.30%
2009 9.00%
2010 11.30%
2011 9.20%
2012 10.20%
2013 12.90%
2014 24.70%

*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.