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 3.30% 6.90%
1911 2.70% 22.90%
1912 5.60% 1.50%
1913 13.80% 1.00%
1914 6.60% 5.50%
1915 14.20% 6.60%
1916 34.30% 0.40%
1917 13.10% 4.80%
1918 0.60% 20.10%
1919 6.20% 0.30%
1920 20.80% 2.00%
1921 6.50% 1.40%
1922 4.60% 2.30%
1923 1.00% 4.10%
1924 13.30% 4.80%
1925 0.40% 14.10%
1926 1.70% 5.90%
1927 9.70% 3.40%
1928 17.10% 2.10%
1929 17.10% 10.90%
1930 2.60% 8.20%
1931 4.60% 31.80%
1932 9.90% 12.20%
1933 0.90% 3.60%
1934 0.10% 27.20%
1935 0.50% 38.30%
1936 3.50% 5.50%
1937 5.70% 19.80%
1938 3.90% 9.60%
1939 2.30% 7.90%
1940 0.00% 28.70%
1941 13.00% 12.40%
1942 26.30% 9.90%
1943 12.80% 2.30%
1944 0.60% 8.20%
1945 5.70% 4.50%
1946 12.10% 0.30%
1947 10.90% 2.30%
1948 13.50% 3.60%
1949 9.70% 2.30%
1950 9.10% 4.10%
1951 13.90% 11.60%
1952 21.70% 10.40%
1953 1.40% 13.00%
1954 2.10% 30.30%
1955 2.10% 36.30%
1956 8.80% 27.00%
1957 0.20% 25.10%
1958 20.00% 0.30%
1959 2.40% 4.00%
1960 9.00% 7.00%
1961 5.70% 13.50%
1962 7.40% 3.70%
1963 0.00% 9.70%
1964 1.80% 26.50%
1965 8.70% 14.70%
1966 9.90% 6.70%
1967 0.00% 6.70%
1968 1.70% 1.50%
1969 12.30% 1.40%
1970 4.80% 0.30%
1971 6.10% 1.70%
1972 12.30% 0.10%
1973 30.60% 0.00%
1974 29.50% 0.30%
1975 22.50% 0.40%
1976 16.60% 3.10%
1977 4.20% 27.50%
1978 8.80% 0.70%
1979 24.30% 0.00%
1980 14.90% 1.10%
1981 0.30% 20.80%
1982 11.00% 1.40%
1983 36.70% 0.30%
1984 25.60% 0.00%
1985 18.80% 3.60%
1986 10.30% 2.20%
1987 23.90% 0.00%
1988 5.90% 12.40%
1989 1.60% 14.70%
1990 8.90% 22.40%
1991 6.20% 14.70%
1992 14.50% 6.70%
1993 33.00% 1.20%
1994 22.30% 1.00%
1995 9.70% 2.30%
1996 28.20% 5.10%
1997 29.20% 5.10%
1998 27.10% 0.20%
1999 10.40% 6.20%
2000 1.10% 24.60%
2001 6.60% 14.20%
2002 3.50% 25.80%
2003 2.80% 25.60%
2004 9.20% 12.20%
2005 22.10% 6.50%
2006 12.50% 15.10%
2007 6.90% 14.50%
2008 6.70% 14.70%
2009 15.60% 9.60%
2010 19.90% 0.00%
2011 18.40% 7.40%
2012 0.50% 17.80%
2013 1.00% 31.10%
2014 7.70% 13.50%

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.