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 5.80%
1911 0.00%
1912 4.70%
1913 0.00%
1914 2.10%
1915 12.40%
1916 20.10%
1917 2.10%
1918 12.20%
1919 13.10%
1920 6.50%
1921 4.10%
1922 11.20%
1923 2.20%
1924 2.10%
1925 8.80%
1926 11.20%
1927 6.80%
1928 10.70%
1929 0.00%
1930 6.10%
1931 10.40%
1932 0.00%
1933 10.00%
1934 10.10%
1935 4.20%
1936 18.10%
1937 0.00%
1938 7.90%
1939 14.60%
1940 20.10%
1941 4.00%
1942 8.10%
1943 10.40%
1944 4.10%
1945 12.40%
1946 9.20%
1947 8.40%
1948 4.20%
1949 12.10%
1950 9.90%
1951 6.00%
1952 10.00%
1953 11.80%
1954 14.00%
1955 17.80%
1956 6.20%
1957 14.20%
1958 2.00%
1959 24.10%
1960 12.00%
1961 14.00%
1962 8.20%
1963 4.00%
1964 16.10%
1965 12.20%
1966 12.00%
1967 11.60%
1968 8.20%
1969 5.80%
1970 9.80%
1971 8.30%
1972 22.30%
1973 2.10%
1974 8.00%
1975 8.00%
1976 6.20%
1977 4.00%
1978 10.40%
1979 3.90%
1980 19.80%
1981 16.00%
1982 12.10%
1983 18.00%
1984 11.70%
1985 13.80%
1986 11.70%
1987 6.10%
1988 13.70%
1989 10.30%
1990 7.90%
1991 14.10%
1992 10.20%
1993 9.90%
1994 8.00%
1995 24.70%
1996 11.90%
1997 10.20%
1998 10.40%
1999 15.90%
2000 4.30%
2001 11.80%
2002 7.80%
2003 8.50%
2004 8.80%
2005 18.80%
2006 19.30%
2007 4.70%
2008 20.70%
2009 0.00%
2010 10.70%
2011 20.60%
2012 8.30%
2013 7.00%

*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.