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 4.20%
1911 5.10%
1912 10.10%
1913 0.00%
1914 0.00%
1915 12.30%
1916 16.00%
1917 15.60%
1918 8.90%
1919 9.30%
1920 0.00%
1921 4.60%
1922 35.80%
1923 5.00%
1924 20.00%
1925 18.20%
1926 14.60%
1927 4.10%
1928 8.10%
1929 0.00%
1930 0.00%
1931 19.10%
1932 15.50%
1933 19.40%
1934 11.50%
1935 3.90%
1936 3.80%
1937 11.50%
1938 15.60%
1939 0.00%
1940 3.60%
1941 14.90%
1942 7.70%
1943 0.00%
1944 7.90%
1945 8.10%
1946 20.20%
1947 7.30%
1948 0.00%
1949 22.90%
1950 7.40%
1951 4.00%
1952 18.70%
1953 37.00%
1954 7.50%
1955 37.40%
1956 3.70%
1957 7.40%
1958 3.70%
1959 7.30%
1960 15.00%
1961 3.60%
1962 7.70%
1963 3.50%
1964 3.90%
1965 3.60%
1966 11.10%
1967 3.60%
1968 0.00%
1969 3.70%
1970 11.00%
1971 11.10%
1972 18.60%
1973 11.60%
1974 7.30%
1975 23.00%
1976 7.40%
1977 7.70%
1978 8.20%
1979 0.00%
1980 3.70%
1981 7.50%
1982 7.80%
1983 7.70%
1984 4.00%
1985 4.00%
1986 0.00%
1987 3.60%
1988 7.80%
1989 14.60%
1990 8.10%
1991 19.30%
1992 7.30%
1993 0.00%
1994 26.20%
1995 7.70%
1996 3.60%
1997 3.80%
1998 15.30%
1999 7.80%
2000 8.40%
2001 7.80%
2002 20.20%
2003 11.70%
2004 11.60%
2005 23.00%
2006 20.00%
2007 7.60%
2008 11.10%
2009 7.90%
2010 8.30%
2011 36.40%
2012 4.50%
2013 29.60%

*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.