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 4.40%
1911 5.30%
1912 10.60%
1913 0.00%
1914 0.00%
1915 12.80%
1916 16.60%
1917 12.30%
1918 8.90%
1919 9.80%
1920 0.00%
1921 4.80%
1922 37.20%
1923 5.20%
1924 20.80%
1925 19.00%
1926 11.30%
1927 4.30%
1928 8.40%
1929 3.80%
1930 0.00%
1931 19.80%
1932 15.50%
1933 20.10%
1934 11.50%
1935 4.00%
1936 4.00%
1937 15.30%
1938 12.00%
1939 0.00%
1940 3.70%
1941 15.50%
1942 8.00%
1943 0.00%
1944 8.20%
1945 12.80%
1946 25.20%
1947 7.60%
1948 0.00%
1949 19.80%
1950 3.90%
1951 4.10%
1952 19.40%
1953 34.40%
1954 7.80%
1955 38.70%
1956 3.90%
1957 7.70%
1958 3.90%
1959 11.50%
1960 15.50%
1961 7.60%
1962 8.00%
1963 0.00%
1964 4.10%
1965 0.00%
1966 11.50%
1967 3.70%
1968 0.00%
1969 3.80%
1970 11.40%
1971 11.50%
1972 19.20%
1973 12.00%
1974 3.70%
1975 23.90%
1976 7.70%
1977 8.00%
1978 8.50%
1979 0.00%
1980 3.80%
1981 4.00%
1982 4.00%
1983 11.90%
1984 4.10%
1985 4.20%
1986 0.00%
1987 3.70%
1988 8.10%
1989 15.20%
1990 8.40%
1991 16.20%
1992 3.90%
1993 0.00%
1994 27.10%
1995 8.00%
1996 3.70%
1997 3.90%
1998 12.10%
1999 8.10%
2000 8.40%
2001 8.10%
2002 20.90%
2003 12.10%
2004 8.30%
2005 23.90%
2006 20.80%
2007 7.80%
2008 7.80%
2009 8.20%
2010 8.30%
2011 40.90%
2012 4.50%
2013 24.00%
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.