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% 15.90%
1911 0.00% 14.40%
1912 17.40% 0.30%
1913 6.40% 0.50%
1914 10.70% 10.00%
1915 26.40% 0.90%
1916 24.20% 0.00%
1917 4.60% 9.80%
1918 0.30% 10.70%
1919 16.00% 2.80%
1920 20.80% 0.50%
1921 3.60% 1.80%
1922 3.50% 2.70%
1923 5.90% 3.90%
1924 7.10% 7.00%
1925 0.10% 16.80%
1926 2.60% 4.30%
1927 22.00% 4.90%
1928 18.60% 1.10%
1929 13.80% 9.70%
1930 2.20% 15.10%
1931 6.10% 30.40%
1932 7.90% 4.10%
1933 0.30% 6.90%
1934 0.00% 54.00%
1935 1.80% 22.50%
1936 2.30% 24.20%
1937 4.40% 19.30%
1938 5.20% 4.50%
1939 0.00% 16.40%
1940 0.70% 17.60%
1941 34.00% 12.80%
1942 26.00% 3.10%
1943 3.70% 4.60%
1944 4.60% 7.40%
1945 13.00% 0.10%
1946 9.50% 0.90%
1947 10.40% 1.60%
1948 14.30% 4.90%
1949 4.30% 3.20%
1950 12.70% 5.40%
1951 17.30% 10.70%
1952 5.40% 12.60%
1953 3.50% 19.20%
1954 3.50% 41.00%
1955 0.40% 26.60%
1956 3.70% 37.30%
1957 4.60% 4.00%
1958 18.10% 1.80%
1959 5.40% 7.30%
1960 8.30% 8.10%
1961 9.20% 6.80%
1962 1.60% 1.80%
1963 0.20% 23.10%
1964 4.60% 18.70%
1965 15.00% 8.30%
1966 3.90% 8.60%
1967 0.90% 1.50%
1968 7.40% 1.10%
1969 5.70% 0.50%
1970 3.40% 0.10%
1971 12.30% 3.60%
1972 12.60% 0.00%
1973 34.10% 0.00%
1974 20.80% 0.30%
1975 25.80% 0.80%
1976 7.20% 6.50%
1977 1.60% 11.20%
1978 14.80% 0.10%
1979 26.80% 0.30%
1980 4.50% 5.20%
1981 3.00% 9.60%
1982 17.50% 0.00%
1983 41.00% 0.00%
1984 23.60% 1.20%
1985 20.90% 1.40%
1986 12.50% 4.30%
1987 12.80% 7.60%
1988 0.00% 23.10%
1989 8.90% 20.20%
1990 7.10% 18.20%
1991 8.80% 5.50%
1992 20.00% 7.50%
1993 26.20% 0.00%
1994 14.20% 0.70%
1995 18.30% 0.10%
1996 28.60% 5.60%
1997 30.00% 0.60%
1998 20.70% 1.00%
1999 7.10% 9.90%
2000 1.90% 22.60%
2001 2.10% 22.00%
2002 1.90% 27.50%
2003 11.40% 19.30%
2004 11.60% 4.90%
2005 13.50% 1.60%
2006 4.40% 15.10%
2007 4.20% 28.70%
2008 14.40% 9.80%
2009 19.30% 4.40%
2010 15.60% 0.70%
2011 19.30% 24.60%
2012 1.10% 34.00%
2013 8.20% 24.70%

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.