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.

Download: Wet Data | Dry Data
Year Wet Dry
1910 0.00% 16.30%
1911 0.00% 29.30%
1912 15.40% 3.80%
1913 1.90% 14.50%
1914 0.00% 34.80%
1915 0.00% 19.90%
1916 7.60% 9.70%
1917 3.70% 3.60%
1918 0.00% 20.30%
1919 1.80% 1.80%
1920 5.30% 7.00%
1921 0.00% 5.40%
1922 17.40% 0.00%
1923 3.90% 18.20%
1924 15.30% 1.70%
1925 0.00% 45.00%
1926 3.30% 17.10%
1927 44.80% 1.80%
1928 0.00% 29.30%
1929 19.40% 0.00%
1930 0.00% 24.90%
1931 0.00% 3.70%
1932 0.00% 23.80%
1933 29.20% 0.00%
1934 0.00% 57.70%
1935 19.90% 1.70%
1936 0.00% 36.70%
1937 1.70% 7.00%
1938 13.80% 0.00%
1939 0.00% 13.70%
1940 8.60% 1.80%
1941 0.00% 42.50%
1942 1.70% 10.40%
1943 18.90% 0.00%
1944 25.00% 0.00%
1945 41.30% 0.00%
1946 12.30% 0.00%
1947 25.80% 0.00%
1948 0.00% 1.90%
1949 1.80% 3.50%
1950 5.20% 5.20%
1951 10.40% 0.00%
1952 3.50% 1.80%
1953 18.70% 0.00%
1954 0.00% 7.00%
1955 0.00% 3.50%
1956 13.50% 24.20%
1957 19.10% 0.00%
1958 5.40% 13.70%
1959 3.30% 5.20%
1960 1.70% 5.30%
1961 23.90% 0.00%
1962 1.70% 12.00%
1963 0.00% 3.50%
1964 3.50% 1.80%
1965 1.80% 0.00%
1966 6.80% 5.20%
1967 10.20% 3.40%
1968 8.60% 3.40%
1969 0.00% 8.70%
1970 3.50% 1.80%
1971 0.00% 42.60%
1972 0.00% 3.60%
1973 77.80% 0.00%
1974 20.80% 3.50%
1975 1.90% 1.80%
1976 0.00% 5.50%
1977 0.00% 10.40%
1978 3.80% 3.70%
1979 15.60% 0.00%
1980 3.60% 0.00%
1981 0.00% 1.70%
1982 1.90% 1.80%
1983 37.40% 0.00%
1984 40.40% 0.00%
1985 1.70% 8.50%
1986 0.00% 7.20%
1987 0.00% 20.30%
1988 0.00% 38.30%
1989 6.80% 8.70%
1990 23.50% 1.80%
1991 6.70% 3.50%
1992 12.00% 10.40%
1993 16.60% 1.90%
1994 0.00% 30.20%
1995 12.10% 3.60%
1996 10.50% 0.00%
1997 6.90% 1.70%
1998 22.50% 1.70%
1999 0.00% 3.50%
2000 1.90% 14.20%
2001 1.80% 3.60%
2002 12.90% 3.70%
2003 1.80% 1.80%
2004 16.30% 0.00%
2005 1.70% 20.70%
2006 7.30% 0.00%
2007 1.80% 17.40%
2008 17.90% 0.00%
2009 21.70% 3.80%
2010 0.00% 11.60%
2011 40.20% 2.10%
2012 0.00% 39.60%
2013 10.00% 4.90%

*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.