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 2.40%
1911 2.40%
1912 14.70%
1913 0.00%
1914 11.50%
1915 26.00%
1916 12.40%
1917 0.00%
1918 6.00%
1919 4.00%
1920 10.60%
1921 4.10%
1922 4.20%
1923 0.00%
1924 7.90%
1925 2.10%
1926 10.20%
1927 6.30%
1928 15.50%
1929 21.50%
1930 2.10%
1931 2.00%
1932 17.70%
1933 12.00%
1934 5.70%
1935 2.10%
1936 27.10%
1937 6.50%
1938 9.80%
1939 6.00%
1940 5.70%
1941 10.20%
1942 5.70%
1943 19.70%
1944 14.20%
1945 10.50%
1946 8.00%
1947 11.90%
1948 12.40%
1949 2.10%
1950 9.80%
1951 6.20%
1952 1.90%
1953 9.80%
1954 3.80%
1955 11.30%
1956 7.80%
1957 5.70%
1958 5.60%
1959 8.00%
1960 7.80%
1961 15.60%
1962 5.90%
1963 8.30%
1964 38.20%
1965 8.20%
1966 8.00%
1967 7.90%
1968 4.10%
1969 16.70%
1970 4.10%
1971 2.00%
1972 10.20%
1973 4.50%
1974 2.10%
1975 9.90%
1976 6.10%
1977 9.50%
1978 6.30%
1979 23.20%
1980 7.80%
1981 3.80%
1982 8.30%
1983 24.10%
1984 17.80%
1985 19.50%
1986 9.70%
1987 3.90%
1988 6.00%
1989 8.40%
1990 17.90%
1991 15.80%
1992 16.00%
1993 6.00%
1994 13.20%
1995 24.10%
1996 11.90%
1997 9.90%
1998 31.60%
1999 25.40%
2000 3.90%
2001 10.00%
2002 16.00%
2003 12.20%
2004 14.40%
2005 13.50%
2006 20.10%
2007 10.90%
2008 12.60%
2009 12.20%
2010 21.20%
2011 11.30%
2012 2.90%
2013 30.80%

*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.