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% 16.60%
1911 0.00% 29.90%
1912 15.70% 3.80%
1913 1.90% 14.80%
1914 0.00% 35.50%
1915 0.00% 22.40%
1916 7.60% 9.70%
1917 3.80% 3.70%
1918 0.00% 20.70%
1919 3.70% 1.80%
1920 3.60% 7.10%
1921 0.00% 5.50%
1922 17.70% 0.00%
1923 3.90% 18.60%
1924 15.60% 1.70%
1925 0.00% 45.80%
1926 3.40% 17.40%
1927 51.20% 1.80%
1928 0.00% 29.80%
1929 19.70% 0.00%
1930 0.00% 23.50%
1931 0.00% 1.90%
1932 0.00% 24.30%
1933 29.70% 0.00%
1934 0.00% 56.90%
1935 20.30% 1.80%
1936 0.00% 35.50%
1937 1.70% 7.20%
1938 14.00% 0.00%
1939 0.00% 14.00%
1940 8.80% 1.80%
1941 0.00% 41.50%
1942 1.70% 10.60%
1943 19.20% 0.00%
1944 27.10% 0.00%
1945 40.20% 0.00%
1946 12.50% 0.00%
1947 26.30% 0.00%
1948 0.00% 2.00%
1949 1.80% 3.60%
1950 5.30% 5.30%
1951 10.60% 0.00%
1952 3.50% 1.80%
1953 17.30% 0.00%
1954 0.00% 7.10%
1955 0.00% 3.60%
1956 13.70% 24.60%
1957 19.40% 0.00%
1958 5.50% 13.90%
1959 3.40% 3.50%
1960 1.70% 5.40%
1961 22.60% 0.00%
1962 1.70% 14.00%
1963 0.00% 3.50%
1964 3.60% 1.80%
1965 1.80% 0.00%
1966 6.90% 5.30%
1967 10.40% 3.50%
1968 8.80% 3.40%
1969 0.00% 8.80%
1970 3.50% 1.80%
1971 0.00% 43.40%
1972 0.00% 3.60%
1973 79.30% 0.00%
1974 21.20% 3.60%
1975 1.90% 1.90%
1976 0.00% 5.60%
1977 0.00% 10.60%
1978 3.80% 3.80%
1979 15.90% 0.00%
1980 5.50% 0.00%
1981 0.00% 1.70%
1982 1.90% 1.80%
1983 36.30% 0.00%
1984 39.30% 0.00%
1985 1.70% 8.70%
1986 0.00% 7.30%
1987 0.00% 20.70%
1988 0.00% 39.00%
1989 6.80% 8.70%
1990 23.50% 1.80%
1991 6.80% 3.50%
1992 12.20% 10.60%
1993 15.00% 1.90%
1994 0.00% 30.80%
1995 12.30% 3.60%
1996 10.70% 0.00%
1997 7.00% 1.70%
1998 24.70% 1.70%
1999 0.00% 3.60%
2000 1.90% 14.40%
2001 3.70% 3.70%
2002 13.10% 3.80%
2003 1.80% 1.80%
2004 16.30% 0.00%
2005 1.70% 21.10%
2006 7.50% 0.00%
2007 1.80% 17.70%
2008 18.20% 0.00%
2009 23.70% 3.80%
2010 0.00% 11.60%
2011 40.20% 2.10%
2012 0.00% 39.60%
2013 7.90% 5.90%
2014 0.00% 4.70%

*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.