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 18.90%
1911 11.20%
1912 10.60%
1913 13.60%
1914 9.80%
1915 6.90%
1916 9.00%
1917 5.70%
1918 5.80%
1919 14.00%
1920 3.60%
1921 15.30%
1922 0.00%
1923 18.10%
1924 11.90%
1925 6.00%
1926 3.30%
1927 3.40%
1928 6.10%
1929 26.90%
1930 9.10%
1931 2.90%
1932 9.00%
1933 2.80%
1934 2.90%
1935 8.90%
1936 6.40%
1937 9.30%
1938 6.10%
1939 3.00%
1940 9.30%
1941 5.70%
1942 0.00%
1943 15.70%
1944 12.60%
1945 3.10%
1946 5.80%
1947 12.60%
1948 6.20%
1949 11.90%
1950 12.10%
1951 12.50%
1952 3.00%
1953 9.30%
1954 5.90%
1955 11.90%
1956 0.00%
1957 5.90%
1958 6.40%
1959 5.80%
1960 9.40%
1961 0.00%
1962 2.90%
1963 8.80%
1964 11.90%
1965 5.70%
1966 8.70%
1967 6.20%
1968 9.20%
1969 3.10%
1970 12.00%
1971 6.00%
1972 3.10%
1973 6.20%
1974 8.90%
1975 3.10%
1976 6.00%
1977 2.90%
1978 6.50%
1979 9.90%
1980 16.20%
1981 3.10%
1982 15.60%
1983 6.10%
1984 17.70%
1985 9.10%
1986 6.00%
1987 12.00%
1988 10.10%
1989 9.10%
1990 8.80%
1991 5.50%
1992 6.20%
1993 8.80%
1994 15.20%
1995 8.80%
1996 3.00%
1997 12.20%
1998 15.20%
1999 6.10%
2000 5.80%
2001 6.30%
2002 3.30%
2003 6.20%
2004 3.00%
2005 6.20%
2006 23.50%
2007 29.10%
2008 27.90%
2009 0.00%
2010 3.30%
2011 9.10%
2012 10.80%
2013 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.