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 20.80%
1911 23.20%
1912 25.00%
1913 0.00%
1914 19.00%
1915 4.50%
1916 21.00%
1917 0.00%
1918 20.20%
1919 4.40%
1920 10.50%
1921 10.50%
1922 5.20%
1923 18.20%
1924 0.00%
1925 9.00%
1926 0.00%
1927 5.10%
1928 9.10%
1929 4.60%
1930 14.00%
1931 16.40%
1932 8.70%
1933 0.00%
1934 20.70%
1935 8.00%
1936 4.30%
1937 8.40%
1938 8.30%
1939 4.90%
1940 17.70%
1941 12.20%
1942 13.30%
1943 22.10%
1944 9.00%
1945 9.50%
1946 4.30%
1947 4.20%
1948 28.40%
1949 0.00%
1950 13.50%
1951 21.20%
1952 4.10%
1953 8.60%
1954 8.40%
1955 13.10%
1956 25.10%
1957 8.50%
1958 4.70%
1959 12.70%
1960 0.00%
1961 0.00%
1962 12.40%
1963 16.80%
1964 4.30%
1965 17.00%
1966 8.40%
1967 9.20%
1968 9.00%
1969 16.40%
1970 4.20%
1971 17.50%
1972 26.60%
1973 4.30%
1974 13.90%
1975 4.00%
1976 0.00%
1977 0.00%
1978 12.80%
1979 0.00%
1980 17.00%
1981 4.40%
1982 4.50%
1983 9.00%
1984 0.00%
1985 0.00%
1986 4.10%
1987 18.00%
1988 16.30%
1989 4.10%
1990 12.40%
1991 26.40%
1992 12.60%
1993 0.00%
1994 0.00%
1995 12.90%
1996 21.80%
1997 12.20%
1998 9.40%
1999 4.40%
2000 8.60%
2001 0.00%
2002 4.00%
2003 9.00%
2004 0.00%
2005 12.60%
2006 4.60%
2007 0.00%
2008 0.00%
2009 12.20%
2010 8.70%
2011 5.30%
2012 11.30%
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.