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% 61.70%
1911 8.60% 12.00%
1912 0.00% 23.50%
1913 0.00% 15.20%
1914 35.70% 7.30%
1915 3.60% 11.20%
1916 0.00% 10.80%
1917 0.00% 29.20%
1918 14.90% 3.70%
1919 11.50% 10.70%
1920 4.00% 22.90%
1921 7.60% 17.90%
1922 4.10% 19.80%
1923 10.50% 7.20%
1924 0.00% 50.10%
1925 3.40% 14.50%
1926 18.70% 7.00%
1927 3.80% 0.00%
1928 3.40% 18.10%
1929 0.00% 20.80%
1930 7.50% 7.00%
1931 18.00% 13.10%
1932 0.00% 17.70%
1933 0.00% 13.10%
1934 0.00% 33.30%
1935 0.00% 7.30%
1936 3.50% 7.20%
1937 0.00% 7.20%
1938 3.30% 7.10%
1939 0.00% 31.60%
1940 7.10% 0.00%
1941 65.90% 0.00%
1942 3.70% 12.00%
1943 0.00% 13.90%
1944 3.60% 7.20%
1945 10.10% 11.00%
1946 7.20% 3.40%
1947 7.40% 4.00%
1948 0.00% 25.00%
1949 15.00% 0.00%
1950 0.00% 43.80%
1951 7.10% 0.00%
1952 3.50% 0.00%
1953 0.00% 38.10%
1954 0.00% 16.80%
1955 3.30% 7.20%
1956 0.00% 53.10%
1957 58.40% 0.00%
1958 23.60% 3.70%
1959 6.90% 6.80%
1960 6.90% 0.00%
1961 16.90% 0.00%
1962 0.00% 6.70%
1963 9.80% 6.90%
1964 0.00% 14.10%
1965 33.90% 0.00%
1966 0.00% 16.90%
1967 6.60% 3.50%
1968 3.60% 0.00%
1969 21.80% 0.00%
1970 6.70% 14.90%
1971 3.30% 3.70%
1972 0.00% 0.00%
1973 3.50% 3.80%
1974 0.00% 10.40%
1975 7.40% 15.00%
1976 0.00% 13.80%
1977 0.00% 3.40%
1978 34.10% 10.50%
1979 0.00% 0.00%
1980 7.20% 14.30%
1981 10.10% 0.00%
1982 28.50% 0.00%
1983 59.40% 0.00%
1984 34.40% 0.00%
1985 13.80% 0.00%
1986 22.40% 0.00%
1987 33.20% 0.00%
1988 3.50% 0.00%
1989 3.60% 33.00%
1990 25.00% 0.00%
1991 13.80% 3.50%
1992 40.30% 0.00%
1993 25.10% 0.00%
1994 7.10% 0.00%
1995 10.20% 3.70%
1996 10.20% 11.10%
1997 25.40% 0.00%
1998 35.20% 3.70%
1999 3.40% 3.70%
2000 3.40% 0.00%
2001 3.80% 0.00%
2002 0.00% 25.00%
2003 0.00% 7.30%
2004 11.10% 0.00%
2005 3.40% 0.00%
2006 0.00% 3.90%
2007 6.80% 10.20%
2008 4.00% 4.30%
2009 7.90% 8.50%
2010 3.70% 0.00%
2011 10.20% 5.10%
2012 0.00% 25.30%
2013 8.90% 0.00%
2014 30.60% 5.20%

*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.