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 17.60%
1911 3.70%
1912 10.80%
1913 3.40%
1914 13.20%
1915 3.40%
1916 19.50%
1917 6.80%
1918 18.80%
1919 2.90%
1920 3.00%
1921 8.90%
1922 18.40%
1923 11.90%
1924 0.00%
1925 11.50%
1926 3.00%
1927 9.60%
1928 6.30%
1929 12.00%
1930 3.10%
1931 3.00%
1932 5.90%
1933 6.10%
1934 15.10%
1935 0.00%
1936 8.60%
1937 8.80%
1938 9.20%
1939 6.00%
1940 2.90%
1941 0.00%
1942 18.20%
1943 9.10%
1944 2.80%
1945 3.20%
1946 0.00%
1947 12.20%
1948 12.30%
1949 0.00%
1950 5.60%
1951 3.00%
1952 2.80%
1953 8.90%
1954 11.90%
1955 8.90%
1956 5.80%
1957 11.50%
1958 0.00%
1959 2.90%
1960 3.00%
1961 5.90%
1962 2.80%
1963 3.10%
1964 5.50%
1965 2.80%
1966 11.80%
1967 8.70%
1968 3.20%
1969 0.00%
1970 6.00%
1971 5.70%
1972 15.40%
1973 5.70%
1974 9.50%
1975 3.00%
1976 0.00%
1977 2.90%
1978 6.30%
1979 0.00%
1980 0.00%
1981 2.80%
1982 3.40%
1983 3.10%
1984 9.00%
1985 5.90%
1986 0.00%
1987 3.00%
1988 20.80%
1989 12.60%
1990 0.00%
1991 15.40%
1992 2.90%
1993 0.00%
1994 3.10%
1995 2.90%
1996 9.30%
1997 6.60%
1998 6.00%
1999 12.40%
2000 15.50%
2001 12.10%
2002 2.90%
2003 6.30%
2004 18.40%
2005 12.50%
2006 0.00%
2007 3.00%
2008 14.00%
2009 9.70%
2010 13.60%
2011 9.10%
2012 14.50%
2013 10.80%
2014 17.50%

*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.