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% 40.70%
1911 0.80% 24.00%
1912 15.60% 4.80%
1913 2.30% 16.80%
1914 3.70% 20.20%
1915 11.00% 12.90%
1916 4.00% 16.70%
1917 5.50% 9.50%
1918 1.00% 18.20%
1919 4.20% 7.00%
1920 6.40% 7.10%
1921 2.20% 10.40%
1922 10.40% 4.20%
1923 8.10% 11.20%
1924 5.40% 14.80%
1925 1.30% 30.00%
1926 11.80% 21.40%
1927 15.30% 10.10%
1928 5.10% 15.10%
1929 9.00% 5.00%
1930 2.50% 8.60%
1931 1.90% 12.10%
1932 3.20% 9.60%
1933 6.80% 6.40%
1934 2.30% 36.50%
1935 11.90% 3.30%
1936 3.50% 20.30%
1937 2.80% 5.30%
1938 13.60% 1.70%
1939 1.70% 15.50%
1940 3.50% 4.00%
1941 24.90% 14.40%
1942 3.50% 3.30%
1943 5.60% 3.20%
1944 19.10% 2.10%
1945 15.10% 4.20%
1946 5.30% 4.20%
1947 17.60% 4.10%
1948 12.90% 4.60%
1949 5.30% 4.10%
1950 6.90% 6.00%
1951 7.10% 8.30%
1952 7.60% 5.80%
1953 13.40% 1.30%
1954 1.20% 7.70%
1955 1.90% 10.10%
1956 4.20% 14.80%
1957 35.30% 1.20%
1958 22.20% 7.90%
1959 6.20% 11.10%
1960 6.80% 6.60%
1961 12.00% 4.00%
1962 2.70% 9.90%
1963 7.50% 6.30%
1964 3.00% 3.90%
1965 15.10% 4.80%
1966 2.70% 24.80%
1967 9.60% 9.00%
1968 8.70% 3.20%
1969 2.00% 9.90%
1970 6.60% 3.50%
1971 2.10% 14.50%
1972 5.30% 14.40%
1973 34.90% 4.50%
1974 11.90% 8.70%
1975 21.40% 0.70%
1976 5.90% 4.40%
1977 5.30% 6.40%
1978 8.20% 3.30%
1979 13.00% 1.10%
1980 13.10% 7.60%
1981 7.10% 4.80%
1982 13.80% 1.50%
1983 28.90% 1.00%
1984 20.60% 3.70%
1985 3.20% 5.80%
1986 3.90% 7.70%
1987 7.50% 7.20%
1988 1.10% 12.30%
1989 11.30% 8.50%
1990 16.70% 2.00%
1991 22.50% 2.00%
1992 11.90% 9.70%
1993 18.10% 0.80%
1994 4.50% 13.10%
1995 33.40% 2.40%
1996 7.20% 11.60%
1997 7.80% 7.00%
1998 18.30% 6.10%
1999 6.40% 3.70%
2000 2.60% 5.70%
2001 4.10% 5.50%
2002 7.00% 11.20%
2003 15.50% 5.40%
2004 11.30% 11.00%
2005 8.20% 6.20%
2006 11.30% 7.80%
2007 9.10% 16.90%
2008 4.00% 9.60%
2009 8.00% 2.20%
2010 7.60% 5.40%
2011 37.70% 10.90%
2012 8.40% 15.50%
2013 8.00% 8.10%
2014 4.20% 2.30%

*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.