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 0.20% 13.00%
1911 0.00% 18.00%
1912 17.30% 0.30%
1913 7.30% 0.40%
1914 11.40% 10.40%
1915 24.80% 1.10%
1916 25.80% 0.00%
1917 6.00% 9.60%
1918 0.10% 14.10%
1919 14.90% 3.10%
1920 19.30% 0.50%
1921 3.60% 1.70%
1922 3.60% 2.50%
1923 4.60% 4.00%
1924 7.20% 7.40%
1925 0.30% 17.80%
1926 2.90% 5.00%
1927 22.60% 5.10%
1928 19.60% 1.10%
1929 14.10% 8.80%
1930 2.20% 12.60%
1931 5.80% 34.40%
1932 7.70% 5.10%
1933 0.40% 5.40%
1934 0.00% 52.80%
1935 1.50% 24.20%
1936 2.20% 24.30%
1937 3.80% 20.30%
1938 5.60% 3.90%
1939 0.00% 14.40%
1940 0.70% 17.70%
1941 31.20% 11.60%
1942 25.60% 3.00%
1943 4.40% 4.90%
1944 4.70% 6.90%
1945 12.60% 0.10%
1946 10.70% 0.70%
1947 9.50% 1.50%
1948 13.00% 4.60%
1949 5.80% 3.00%
1950 12.70% 4.00%
1951 16.80% 10.40%
1952 7.00% 12.80%
1953 2.60% 17.10%
1954 4.40% 38.70%
1955 0.10% 25.70%
1956 3.80% 36.90%
1957 3.90% 5.00%
1958 19.10% 1.70%
1959 4.70% 6.10%
1960 6.70% 7.90%
1961 7.40% 6.80%
1962 1.80% 1.80%
1963 0.20% 20.00%
1964 4.30% 20.00%
1965 13.90% 8.70%
1966 5.20% 8.40%
1967 0.70% 1.20%
1968 6.60% 1.00%
1969 6.40% 0.80%
1970 2.40% 0.10%
1971 11.40% 1.90%
1972 10.80% 0.00%
1973 34.60% 0.80%
1974 20.60% 0.30%
1975 25.00% 0.80%
1976 7.30% 5.70%
1977 1.50% 14.30%
1978 13.80% 1.10%
1979 26.60% 0.30%
1980 6.20% 4.30%
1981 2.70% 12.60%
1982 16.70% 0.00%
1983 40.60% 0.00%
1984 25.80% 1.20%
1985 20.40% 1.30%
1986 10.80% 5.30%
1987 13.10% 6.90%
1988 0.00% 23.50%
1989 7.90% 19.90%
1990 6.50% 15.80%
1991 6.60% 5.10%
1992 17.60% 8.60%
1993 28.30% 0.00%
1994 15.30% 1.10%
1995 18.80% 0.30%
1996 27.30% 5.60%
1997 30.60% 1.00%
1998 20.50% 0.70%
1999 9.10% 9.50%
2000 1.00% 21.00%
2001 2.00% 19.50%
2002 1.40% 30.30%
2003 13.00% 17.30%
2004 11.60% 4.00%
2005 15.30% 1.80%
2006 4.40% 15.40%
2007 3.90% 26.30%
2008 13.90% 9.50%
2009 18.30% 4.10%
2010 14.60% 0.40%
2011 20.00% 24.90%
2012 1.00% 31.50%
2013 7.00% 21.60%
2014 12.70% 14.20%

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.