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% 13.30%
1911 0.00% 46.70%
1912 4.60% 0.00%
1913 0.00% 3.80%
1914 0.00% 3.90%
1915 0.00% 4.20%
1916 3.90% 0.00%
1917 19.80% 0.00%
1918 0.00% 22.70%
1919 0.70% 0.00%
1920 19.40% 0.00%
1921 0.00% 33.50%
1922 13.50% 0.00%
1923 7.60% 2.50%
1924 3.30% 0.00%
1925 0.00% 27.90%
1926 0.00% 2.50%
1927 22.20% 0.00%
1928 47.00% 0.00%
1929 8.20% 0.00%
1930 0.00% 20.10%
1931 0.00% 13.20%
1932 0.00% 1.50%
1933 3.00% 1.40%
1934 0.00% 32.40%
1935 0.70% 0.00%
1936 11.00% 34.40%
1937 3.10% 0.00%
1938 9.20% 0.00%
1939 0.00% 7.00%
1940 0.00% 0.00%
1941 0.00% 37.10%
1942 0.00% 7.30%
1943 4.00% 16.30%
1944 0.00% 14.00%
1945 35.50% 0.00%
1946 0.00% 0.00%
1947 14.00% 0.00%
1948 2.90% 11.00%
1949 0.00% 40.80%
1950 21.80% 13.30%
1951 9.50% 1.30%
1952 7.30% 3.90%
1953 0.30% 0.00%
1954 26.80% 34.50%
1955 0.00% 7.80%
1956 5.20% 7.10%
1957 18.30% 37.10%
1958 39.30% 0.00%
1959 0.00% 2.90%
1960 0.00% 0.00%
1961 4.90% 0.00%
1962 0.00% 15.80%
1963 0.00% 15.70%
1964 0.00% 42.80%
1965 0.00% 70.10%
1966 0.00% 53.00%
1967 1.30% 0.00%
1968 9.00% 0.00%
1969 0.00% 0.50%
1970 0.00% 0.00%
1971 0.00% 0.00%
1972 44.50% 7.20%
1973 68.30% 0.00%
1974 32.70% 0.00%
1975 20.00% 0.00%
1976 42.00% 1.00%
1977 0.00% 2.20%
1978 0.50% 2.70%
1979 31.90% 0.00%
1980 0.00% 13.10%
1981 0.00% 9.60%
1982 0.00% 0.00%
1983 11.10% 0.00%
1984 25.50% 0.00%
1985 2.50% 8.90%
1986 1.60% 9.40%
1987 0.00% 1.00%
1988 0.00% 10.50%
1989 27.40% 0.00%
1990 13.60% 0.00%
1991 6.00% 11.60%
1992 3.80% 0.00%
1993 2.50% 1.00%
1994 2.60% 0.00%
1995 0.00% 42.70%
1996 50.10% 0.00%
1997 17.50% 0.00%
1998 7.40% 3.70%
1999 0.00% 54.50%
2000 24.00% 3.70%
2001 0.00% 32.20%
2002 0.00% 10.40%
2003 13.40% 0.00%
2004 19.00% 0.00%
2005 11.50% 2.90%
2006 53.60% 18.00%
2007 25.10% 4.30%
2008 40.50% 0.00%
2009 65.40% 0.00%
2010 4.60% 6.10%
2011 45.90% 10.20%
2012 0.00% 30.10%
2013 8.70% 0.00%

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.