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% 33.10%
1911 0.00% 51.90%
1912 16.00% 0.00%
1913 4.30% 8.60%
1914 0.00% 18.30%
1915 0.00% 47.20%
1916 23.70% 9.20%
1917 10.20% 5.20%
1918 0.00% 18.60%
1919 4.30% 4.40%
1920 0.00% 18.20%
1921 0.00% 9.60%
1922 4.70% 18.20%
1923 0.00% 45.40%
1924 5.40% 20.80%
1925 0.00% 27.30%
1926 4.20% 44.10%
1927 0.00% 9.00%
1928 4.40% 4.60%
1929 22.60% 0.00%
1930 0.00% 29.70%
1931 0.00% 4.40%
1932 0.00% 21.90%
1933 17.10% 4.10%
1934 4.50% 26.10%
1935 0.00% 12.10%
1936 31.30% 4.60%
1937 12.30% 0.00%
1938 12.50% 0.00%
1939 12.00% 0.00%
1940 24.20% 0.00%
1941 0.00% 71.00%
1942 4.00% 4.10%
1943 43.90% 0.00%
1944 0.00% 8.10%
1945 37.30% 4.20%
1946 0.00% 4.10%
1947 47.70% 0.00%
1948 32.20% 0.00%
1949 3.90% 0.00%
1950 12.20% 0.00%
1951 4.10% 0.00%
1952 12.40% 3.90%
1953 60.40% 0.00%
1954 12.00% 0.00%
1955 0.00% 4.30%
1956 28.10% 0.00%
1957 0.00% 7.70%
1958 4.20% 4.00%
1959 8.40% 8.00%
1960 0.00% 0.00%
1961 16.10% 0.00%
1962 0.00% 40.30%
1963 0.00% 4.30%
1964 0.00% 7.90%
1965 0.00% 12.20%
1966 0.00% 3.90%
1967 0.00% 0.00%
1968 0.00% 4.00%
1969 0.00% 12.20%
1970 0.00% 0.00%
1971 0.00% 12.10%
1972 4.10% 0.00%
1973 44.00% 0.00%
1974 16.40% 0.00%
1975 4.10% 8.10%
1976 4.00% 4.10%
1977 0.00% 36.00%
1978 0.00% 11.70%
1979 7.80% 0.00%
1980 0.00% 0.00%
1981 4.00% 0.00%
1982 0.00% 8.70%
1983 43.10% 0.00%
1984 48.30% 0.00%
1985 0.00% 13.00%
1986 0.00% 17.80%
1987 4.00% 20.10%
1988 0.00% 0.00%
1989 12.40% 0.00%
1990 0.00% 0.00%
1991 4.10% 3.80%
1992 0.00% 3.80%
1993 4.00% 0.00%
1994 21.00% 0.00%
1995 0.00% 12.20%
1996 0.00% 0.00%
1997 0.00% 0.00%
1998 4.00% 0.00%
1999 0.00% 27.70%
2000 8.30% 4.20%
2001 4.00% 7.80%
2002 45.60% 0.00%
2003 23.00% 4.50%
2004 44.00% 0.00%
2005 0.00% 16.40%
2006 0.00% 26.40%
2007 0.00% 17.70%
2008 0.00% 4.10%
2009 0.00% 8.60%
2010 0.00% 37.90%
2011 66.60% 0.00%
2012 0.00% 14.60%
2013 5.40% 11.00%
2014 0.00% 7.80%

*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.