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% 33.60%
1911 0.00% 15.90%
1912 26.10% 5.00%
1913 2.30% 11.30%
1914 0.00% 49.00%
1915 0.00% 31.20%
1916 0.00% 43.60%
1917 0.00% 13.30%
1918 4.30% 17.10%
1919 6.70% 4.40%
1920 16.60% 0.00%
1921 4.20% 24.00%
1922 23.20% 0.00%
1923 34.00% 4.20%
1924 6.40% 0.00%
1925 0.00% 60.40%
1926 2.30% 25.70%
1927 2.00% 17.70%
1928 24.40% 0.00%
1929 25.80% 0.00%
1930 6.80% 4.20%
1931 4.30% 2.10%
1932 0.00% 2.00%
1933 4.00% 4.00%
1934 16.70% 0.00%
1935 16.50% 2.10%
1936 2.20% 10.30%
1937 4.30% 4.00%
1938 8.20% 6.50%
1939 10.10% 1.90%
1940 1.90% 6.10%
1941 0.00% 50.50%
1942 0.00% 13.80%
1943 0.00% 5.90%
1944 24.30% 4.20%
1945 2.00% 24.20%
1946 20.60% 2.00%
1947 12.90% 6.00%
1948 15.00% 0.00%
1949 6.20% 0.00%
1950 6.00% 0.00%
1951 3.90% 8.00%
1952 2.10% 2.00%
1953 6.50% 4.30%
1954 0.00% 2.00%
1955 0.00% 0.00%
1956 0.00% 8.30%
1957 31.40% 4.00%
1958 36.10% 0.00%
1959 31.20% 0.00%
1960 2.20% 12.50%
1961 8.20% 2.20%
1962 0.00% 4.00%
1963 0.00% 7.90%
1964 2.00% 0.00%
1965 12.40% 2.10%
1966 8.20% 1.90%
1967 0.00% 30.80%
1968 2.00% 0.00%
1969 2.30% 10.20%
1970 4.10% 0.00%
1971 2.20% 2.00%
1972 18.20% 2.00%
1973 46.30% 0.00%
1974 2.20% 0.00%
1975 34.40% 0.00%
1976 13.30% 6.10%
1977 0.00% 8.00%
1978 2.10% 0.00%
1979 10.20% 0.00%
1980 40.10% 0.00%
1981 0.00% 17.20%
1982 8.70% 0.00%
1983 11.70% 0.00%
1984 16.00% 0.00%
1985 0.00% 19.60%
1986 0.00% 54.90%
1987 6.40% 8.10%
1988 0.00% 6.10%
1989 20.00% 0.00%
1990 8.30% 8.70%
1991 59.90% 2.00%
1992 6.10% 10.70%
1993 4.20% 2.10%
1994 0.00% 8.20%
1995 0.00% 10.00%
1996 4.00% 4.10%
1997 2.00% 4.00%
1998 15.60% 6.20%
1999 0.00% 4.30%
2000 1.90% 20.50%
2001 4.10% 0.00%
2002 1.90% 2.20%
2003 58.90% 0.00%
2004 2.00% 28.20%
2005 6.70% 0.00%
2006 0.00% 26.10%
2007 0.00% 63.30%
2008 0.00% 4.20%
2009 32.20% 0.00%
2010 4.60% 2.30%
2011 6.70% 12.00%
2012 5.00% 5.10%
2013 2.70% 8.10%
2014 7.30% 3.50%

*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.