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 17.60% 2.90%
1911 7.10% 16.40%
1912 2.50% 14.00%
1913 0.00% 20.50%
1914 0.00% 20.80%
1915 4.20% 10.30%
1916 17.90% 2.10%
1917 6.20% 8.40%
1918 0.00% 17.10%
1919 13.60% 0.00%
1920 12.30% 6.30%
1921 2.10% 16.90%
1922 11.30% 4.60%
1923 9.30% 11.20%
1924 6.70% 6.70%
1925 0.00% 41.70%
1926 11.10% 4.30%
1927 15.30% 0.00%
1928 31.60% 0.00%
1929 4.30% 8.90%
1930 0.00% 36.40%
1931 2.00% 13.20%
1932 18.90% 8.00%
1933 2.00% 3.90%
1934 10.00% 1.90%
1935 4.30% 0.00%
1936 0.00% 10.30%
1937 18.40% 2.20%
1938 3.90% 2.10%
1939 24.40% 0.00%
1940 8.20% 6.00%
1941 24.80% 0.00%
1942 6.00% 0.00%
1943 2.20% 16.20%
1944 2.10% 7.80%
1945 6.00% 1.90%
1946 2.30% 4.60%
1947 4.20% 6.20%
1948 4.20% 8.50%
1949 31.90% 0.00%
1950 17.40% 0.00%
1951 0.00% 14.20%
1952 3.90% 15.80%
1953 2.00% 21.60%
1954 0.00% 48.60%
1955 2.00% 4.20%
1956 0.00% 10.40%
1957 0.00% 13.70%
1958 10.00% 4.30%
1959 0.00% 8.10%
1960 3.90% 3.80%
1961 25.80% 4.30%
1962 10.70% 0.00%
1963 1.90% 9.60%
1964 10.20% 1.90%
1965 10.40% 0.00%
1966 2.10% 9.70%
1967 21.90% 1.90%
1968 2.10% 5.80%
1969 5.70% 0.00%
1970 6.00% 2.10%
1971 14.30% 0.00%
1972 0.00% 12.50%
1973 19.30% 6.30%
1974 12.20% 4.00%
1975 10.30% 2.00%
1976 0.00% 8.20%
1977 2.10% 7.90%
1978 2.20% 8.40%
1979 2.00% 6.10%
1980 0.00% 60.30%
1981 1.90% 4.00%
1982 12.30% 0.00%
1983 2.10% 47.40%
1984 1.90% 8.00%
1985 13.90% 2.00%
1986 10.10% 11.70%
1987 0.00% 16.60%
1988 0.00% 23.20%
1989 40.10% 2.00%
1990 2.10% 31.90%
1991 12.20% 0.00%
1992 14.20% 0.00%
1993 0.00% 35.10%
1994 48.10% 0.00%
1995 4.00% 2.10%
1996 3.80% 6.00%
1997 7.80% 9.70%
1998 4.00% 29.00%
1999 2.10% 13.60%
2000 8.20% 15.40%
2001 5.90% 0.00%
2002 4.10% 3.90%
2003 54.90% 0.00%
2004 23.20% 0.00%
2005 20.80% 0.00%
2006 0.00% 15.60%
2007 0.00% 8.90%
2008 2.20% 6.20%
2009 5.80% 6.00%
2010 2.10% 6.40%
2011 0.00% 13.90%
2012 5.60% 0.00%
2013 63.90% 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.