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 9.60%
1911 5.20%
1912 5.10%
1913 43.70%
1914 22.70%
1915 0.00%
1916 4.70%
1917 0.00%
1918 4.70%
1919 4.50%
1920 8.90%
1921 4.80%
1922 8.90%
1923 15.10%
1924 10.50%
1925 9.00%
1926 0.00%
1927 0.00%
1928 13.90%
1929 9.10%
1930 4.30%
1931 8.70%
1932 17.80%
1933 12.30%
1934 0.00%
1935 4.00%
1936 9.20%
1937 8.20%
1938 0.00%
1939 0.00%
1940 3.80%
1941 0.00%
1942 12.30%
1943 4.00%
1944 4.20%
1945 4.30%
1946 4.20%
1947 11.60%
1948 4.20%
1949 0.00%
1950 4.20%
1951 12.20%
1952 19.90%
1953 11.90%
1954 16.80%
1955 4.20%
1956 12.00%
1957 7.90%
1958 0.00%
1959 0.00%
1960 8.00%
1961 0.00%
1962 12.20%
1963 0.00%
1964 16.10%
1965 0.00%
1966 0.00%
1967 0.00%
1968 16.90%
1969 11.80%
1970 11.90%
1971 4.00%
1972 0.00%
1973 21.20%
1974 8.30%
1975 0.00%
1976 11.90%
1977 32.10%
1978 0.00%
1979 0.00%
1980 11.90%
1981 0.00%
1982 8.90%
1983 22.00%
1984 20.10%
1985 13.20%
1986 13.00%
1987 8.10%
1988 4.20%
1989 20.90%
1990 16.40%
1991 11.90%
1992 15.50%
1993 28.30%
1994 0.00%
1995 0.00%
1996 17.70%
1997 4.10%
1998 12.10%
1999 11.90%
2000 45.90%
2001 19.80%
2002 4.10%
2003 4.40%
2004 8.10%
2005 20.90%
2006 17.20%
2007 21.90%
2008 20.60%
2009 12.60%
2010 23.90%
2011 44.30%
2012 14.40%
2013 10.90%
2014 46.30%

*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.