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% 37.50%
1911 0.00% 29.90%
1912 0.00% 19.80%
1913 0.00% 45.90%
1914 8.70% 8.80%
1915 38.10% 0.00%
1916 0.00% 7.80%
1917 47.70% 0.00%
1918 4.20% 25.70%
1919 4.70% 9.00%
1920 13.30% 0.00%
1921 0.00% 45.50%
1922 16.00% 8.10%
1923 0.00% 49.40%
1924 0.00% 19.90%
1925 4.40% 9.00%
1926 7.70% 3.60%
1927 11.70% 4.00%
1928 28.10% 0.00%
1929 0.00% 46.40%
1930 3.60% 30.00%
1931 0.00% 3.80%
1932 3.70% 7.70%
1933 0.00% 34.30%
1934 3.80% 18.90%
1935 3.80% 0.00%
1936 0.00% 19.20%
1937 0.00% 0.00%
1938 7.60% 0.00%
1939 4.00% 7.60%
1940 0.00% 0.00%
1941 0.00% 0.00%
1942 11.70% 3.90%
1943 3.60% 3.70%
1944 0.00% 8.20%
1945 12.70% 0.00%
1946 0.00% 4.10%
1947 7.60% 3.70%
1948 4.00% 0.00%
1949 0.00% 53.20%
1950 0.00% 3.70%
1951 7.50% 3.80%
1952 0.00% 7.30%
1953 0.00% 37.30%
1954 10.80% 3.80%
1955 0.00% 7.60%
1956 26.10% 3.70%
1957 0.00% 25.90%
1958 7.70% 7.20%
1959 10.90% 0.00%
1960 0.00% 3.70%
1961 7.60% 0.00%
1962 0.00% 7.80%
1963 0.00% 14.70%
1964 3.90% 0.00%
1965 0.00% 7.40%
1966 0.00% 41.30%
1967 7.40% 0.00%
1968 0.00% 0.00%
1969 7.50% 0.00%
1970 0.00% 3.60%
1971 0.00% 22.00%
1972 29.30% 0.00%
1973 3.60% 7.80%
1974 7.20% 3.70%
1975 0.00% 0.00%
1976 7.30% 3.90%
1977 15.20% 0.00%
1978 4.10% 8.00%
1979 3.80% 0.00%
1980 11.10% 0.00%
1981 7.50% 3.90%
1982 0.00% 3.90%
1983 0.00% 19.10%
1984 4.10% 0.00%
1985 0.00% 0.00%
1986 29.30% 0.00%
1987 0.00% 0.00%
1988 3.60% 19.60%
1989 15.00% 3.60%
1990 8.00% 0.00%
1991 0.00% 19.50%
1992 29.70% 0.00%
1993 3.70% 0.00%
1994 15.00% 0.00%
1995 0.00% 15.00%
1996 11.00% 0.00%
1997 3.70% 7.20%
1998 15.00% 0.00%
1999 0.00% 15.70%
2000 29.10% 0.00%
2001 3.90% 11.30%
2002 0.00% 4.00%
2003 54.40% 0.00%
2004 69.20% 0.00%
2005 3.80% 11.40%
2006 24.00% 0.00%
2007 0.00% 3.70%
2008 46.30% 4.00%
2009 64.00% 0.00%
2010 16.50% 12.50%
2011 9.10% 0.00%
2012 4.60% 4.50%
2013 18.00% 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.