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
1911 0.00% 22.00%
1912 5.80% 3.10%
1913 9.70% 1.00%
1914 13.60% 4.80%
1915 12.40% 5.80%
1916 31.60% 0.00%
1917 16.10% 4.30%
1918 0.90% 18.40%
1919 2.90% 0.90%
1920 22.30% 4.20%
1921 9.70% 1.20%
1922 3.70% 4.30%
1923 1.00% 4.70%
1924 14.90% 2.60%
1925 1.50% 10.40%
1926 1.50% 6.00%
1927 10.80% 3.10%
1928 20.40% 3.00%
1929 17.60% 9.70%
1930 3.80% 8.60%
1931 3.60% 28.50%
1932 9.70% 15.00%
1933 3.80% 1.90%
1934 1.20% 26.80%
1935 0.70% 39.50%
1936 2.80% 8.90%
1937 4.00% 25.10%
1938 2.80% 11.70%
1939 5.70% 7.50%
1940 0.00% 32.90%
1941 8.30% 10.40%
1942 33.30% 10.50%
1943 12.30% 2.00%
1944 0.50% 4.70%
1945 4.40% 6.30%
1946 12.70% 0.00%
1947 11.00% 2.20%
1948 12.50% 5.30%
1949 9.90% 3.00%
1950 6.30% 3.00%
1951 12.20% 11.70%
1952 18.60% 10.60%
1953 0.90% 13.90%
1954 2.10% 31.50%
1955 1.50% 40.70%
1956 9.50% 27.30%
1957 0.90% 32.70%
1958 18.80% 0.00%
1959 3.00% 3.20%
1960 8.50% 7.90%
1961 6.40% 12.60%
1962 10.70% 5.00%
1963 0.20% 8.20%
1964 0.50% 27.80%
1965 11.90% 13.70%
1966 13.80% 7.10%
1967 0.00% 5.90%
1968 2.40% 1.60%
1969 13.30% 0.90%
1970 6.40% 0.30%
1971 8.60% 0.90%
1972 11.00% 0.40%
1973 25.40% 0.00%
1974 28.90% 0.00%
1975 17.80% 1.20%
1976 16.50% 0.40%
1977 4.50% 27.90%
1978 8.70% 2.00%
1979 18.00% 0.00%
1980 13.60% 1.70%
1981 0.70% 19.90%
1982 8.70% 2.50%
1983 31.20% 0.40%
1984 28.10% 0.00%
1985 17.40% 2.70%
1986 13.80% 0.00%
1987 18.80% 0.00%
1988 5.90% 12.40%
1989 0.30% 17.50%
1990 9.40% 25.00%
1991 6.80% 20.50%
1992 14.20% 5.80%
1993 30.80% 1.50%
1994 21.70% 0.10%
1995 8.60% 0.00%
1996 25.30% 2.50%
1997 32.40% 3.70%
1998 22.90% 0.40%
1999 13.70% 6.30%
2000 1.10% 21.90%
2001 5.10% 14.40%
2002 4.50% 23.90%
2003 4.80% 28.00%
2004 10.60% 10.90%
2005 26.10% 5.70%
2006 12.10% 11.90%
2007 8.00% 11.60%
2008 5.10% 15.80%
2009 16.80% 7.40%
2010 22.50% 0.30%
2011 18.60% 8.50%
2012 3.90% 17.90%
2013 1.30% 30.30%
2014 10.10% 11.30%

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.