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 20.20%
1911 12.80%
1912 19.40%
1913 9.70%
1914 9.00%
1915 0.00%
1916 4.60%
1917 0.00%
1918 8.70%
1919 8.80%
1920 4.80%
1921 4.50%
1922 18.50%
1923 8.90%
1924 0.00%
1925 8.70%
1926 17.90%
1927 21.30%
1928 0.00%
1929 4.50%
1930 4.90%
1931 22.70%
1932 0.00%
1933 16.60%
1934 16.40%
1935 8.40%
1936 16.50%
1937 8.40%
1938 4.30%
1939 0.00%
1940 4.20%
1941 4.70%
1942 4.00%
1943 4.60%
1944 0.00%
1945 8.30%
1946 4.30%
1947 8.60%
1948 0.00%
1949 4.30%
1950 12.90%
1951 22.70%
1952 0.00%
1953 0.00%
1954 0.00%
1955 0.00%
1956 12.00%
1957 4.70%
1958 13.20%
1959 4.10%
1960 12.50%
1961 4.00%
1962 0.00%
1963 4.10%
1964 0.00%
1965 4.30%
1966 4.20%
1967 30.50%
1968 4.30%
1969 12.60%
1970 4.10%
1971 4.00%
1972 12.60%
1973 0.00%
1974 8.40%
1975 4.00%
1976 4.20%
1977 25.00%
1978 0.00%
1979 4.60%
1980 4.20%
1981 4.20%
1982 4.10%
1983 8.10%
1984 16.60%
1985 22.90%
1986 4.10%
1987 14.00%
1988 8.40%
1989 4.30%
1990 0.00%
1991 12.20%
1992 21.40%
1993 9.10%
1994 0.00%
1995 4.50%
1996 4.60%
1997 4.40%
1998 4.80%
1999 0.00%
2000 8.50%
2001 4.20%
2002 8.90%
2003 4.60%
2004 13.10%
2005 0.00%
2006 0.00%
2007 0.00%
2008 0.00%
2009 4.50%
2010 19.10%
2011 5.60%
2012 0.00%
2013 25.00%

*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.