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 1.80%
1911 3.70%
1912 11.60%
1913 35.70%
1914 11.30%
1915 14.00%
1916 1.90%
1917 7.40%
1918 20.40%
1919 5.40%
1920 12.00%
1921 5.10%
1922 15.70%
1923 9.20%
1924 0.00%
1925 5.30%
1926 1.70%
1927 10.60%
1928 7.00%
1929 10.50%
1930 1.80%
1931 3.70%
1932 3.80%
1933 6.80%
1934 7.10%
1935 8.90%
1936 6.80%
1937 3.50%
1938 8.50%
1939 29.20%
1940 8.70%
1941 6.90%
1942 6.90%
1943 18.80%
1944 5.00%
1945 8.70%
1946 0.00%
1947 3.40%
1948 5.50%
1949 1.80%
1950 8.80%
1951 0.00%
1952 12.40%
1953 3.30%
1954 8.40%
1955 3.50%
1956 8.60%
1957 3.50%
1958 3.50%
1959 1.70%
1960 3.50%
1961 6.90%
1962 1.80%
1963 10.60%
1964 34.50%
1965 0.00%
1966 5.20%
1967 10.30%
1968 7.00%
1969 15.40%
1970 22.90%
1971 6.90%
1972 6.90%
1973 12.90%
1974 8.60%
1975 5.50%
1976 10.60%
1977 19.20%
1978 1.80%
1979 10.30%
1980 1.80%
1981 6.80%
1982 3.50%
1983 14.70%
1984 10.70%
1985 12.00%
1986 13.90%
1987 5.10%
1988 5.30%
1989 3.50%
1990 19.30%
1991 8.40%
1992 5.20%
1993 1.80%
1994 20.30%
1995 24.80%
1996 27.90%
1997 5.40%
1998 12.10%
1999 8.70%
2000 5.30%
2001 7.40%
2002 24.20%
2003 9.30%
2004 25.50%
2005 3.50%
2006 12.80%
2007 16.90%
2008 30.10%
2009 17.00%
2010 19.40%
2011 25.40%
2012 6.30%
2013 24.90%

*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.