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
1911 6.60%
1912 0.00%
1913 11.30%
1914 18.70%
1915 27.90%
1916 11.80%
1917 6.70%
1918 23.50%
1919 6.30%
1920 0.00%
1921 13.20%
1922 5.30%
1923 6.00%
1924 18.90%
1925 0.00%
1926 0.00%
1927 5.20%
1928 21.20%
1929 0.00%
1930 5.20%
1931 0.00%
1932 0.00%
1933 25.00%
1934 0.00%
1935 0.00%
1936 11.10%
1937 10.50%
1938 5.10%
1939 0.00%
1940 0.00%
1941 0.00%
1942 5.00%
1943 0.00%
1944 21.50%
1945 0.00%
1946 0.00%
1947 14.80%
1948 0.00%
1949 0.00%
1950 0.00%
1951 35.20%
1952 19.90%
1953 19.60%
1954 0.00%
1955 15.90%
1956 14.90%
1957 0.00%
1958 0.00%
1959 0.00%
1960 25.10%
1961 5.50%
1962 4.80%
1963 0.00%
1964 21.50%
1965 5.30%
1966 0.00%
1967 0.00%
1968 0.00%
1969 9.70%
1970 10.40%
1971 5.10%
1972 0.00%
1973 30.20%
1974 5.60%
1975 0.00%
1976 15.70%
1977 30.10%
1978 39.80%
1979 16.50%
1980 5.20%
1981 0.00%
1982 0.00%
1983 5.10%
1984 25.00%
1985 5.20%
1986 0.00%
1987 10.10%
1988 0.00%
1989 0.00%
1990 4.80%
1991 19.90%
1992 5.40%
1993 5.10%
1994 5.20%
1995 5.30%
1996 42.40%
1997 20.30%
1998 5.00%
1999 26.30%
2000 15.10%
2001 5.30%
2002 6.00%
2003 5.80%
2004 9.90%
2005 0.00%
2006 49.80%
2007 39.10%
2008 52.40%
2009 15.80%
2010 16.40%
2011 56.00%
2012 6.30%
2013 6.70%
2014 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.