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 22.00%
1911 24.40%
1912 25.00%
1913 0.00%
1914 14.70%
1915 4.70%
1916 22.00%
1917 0.00%
1918 20.20%
1919 4.60%
1920 11.10%
1921 10.50%
1922 0.00%
1923 19.10%
1924 0.00%
1925 14.30%
1926 0.00%
1927 5.40%
1928 9.50%
1929 4.90%
1930 14.70%
1931 17.20%
1932 9.10%
1933 0.00%
1934 21.60%
1935 8.30%
1936 4.50%
1937 8.70%
1938 8.70%
1939 5.10%
1940 14.00%
1941 12.70%
1942 13.90%
1943 23.20%
1944 9.40%
1945 10.00%
1946 4.50%
1947 4.40%
1948 29.70%
1949 0.00%
1950 9.40%
1951 26.30%
1952 4.30%
1953 9.00%
1954 4.40%
1955 8.90%
1956 26.20%
1957 8.90%
1958 4.70%
1959 8.70%
1960 0.00%
1961 0.00%
1962 13.00%
1963 17.50%
1964 4.50%
1965 17.80%
1966 8.80%
1967 4.80%
1968 9.50%
1969 17.20%
1970 4.40%
1971 18.30%
1972 23.00%
1973 4.50%
1974 14.60%
1975 4.10%
1976 0.00%
1977 0.00%
1978 13.40%
1979 0.00%
1980 17.80%
1981 4.60%
1982 4.70%
1983 9.50%
1984 0.00%
1985 0.00%
1986 4.30%
1987 18.90%
1988 17.10%
1989 4.30%
1990 13.00%
1991 27.70%
1992 8.60%
1993 0.00%
1994 0.00%
1995 13.50%
1996 22.90%
1997 12.70%
1998 9.80%
1999 4.60%
2000 9.00%
2001 0.00%
2002 4.20%
2003 9.50%
2004 0.00%
2005 8.60%
2006 4.90%
2007 0.00%
2008 0.00%
2009 12.80%
2010 8.70%
2011 5.30%
2012 11.30%
2013 5.30%
2014 10.90%

*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.