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% 19.50%
1911 0.00% 17.20%
1912 51.30% 0.00%
1913 1.00% 2.60%
1914 0.00% 21.00%
1915 4.00% 7.70%
1916 0.00% 2.30%
1917 10.00% 0.00%
1918 0.00% 9.20%
1919 16.50% 0.00%
1920 22.70% 0.00%
1921 0.00% 0.00%
1922 6.90% 0.00%
1923 0.00% 0.00%
1924 0.00% 0.00%
1925 0.00% 8.20%
1926 9.50% 19.80%
1927 0.00% 33.40%
1928 2.90% 3.70%
1929 56.20% 0.00%
1930 10.60% 1.80%
1931 10.40% 28.60%
1932 0.00% 33.20%
1933 1.80% 0.00%
1934 0.00% 21.90%
1935 4.40% 11.10%
1936 11.80% 0.00%
1937 2.00% 0.00%
1938 0.00% 0.00%
1939 2.40% 0.90%
1940 0.00% 2.60%
1941 4.60% 16.60%
1942 11.30% 27.50%
1943 0.00% 1.60%
1944 0.00% 0.00%
1945 0.00% 15.60%
1946 8.70% 0.00%
1947 12.80% 0.00%
1948 43.60% 0.00%
1949 27.70% 7.80%
1950 1.60% 4.40%
1951 0.00% 2.40%
1952 0.00% 0.00%
1953 0.00% 0.00%
1954 4.90% 13.90%
1955 0.00% 58.50%
1956 0.00% 19.50%
1957 0.00% 0.00%
1958 49.90% 0.00%
1959 17.10% 0.00%
1960 36.40% 0.00%
1961 6.70% 0.00%
1962 5.20% 11.30%
1963 0.00% 8.60%
1964 35.70% 0.00%
1965 35.70% 0.00%
1966 16.60% 13.90%
1967 0.00% 2.60%
1968 0.00% 0.00%
1969 3.70% 1.80%
1970 2.90% 0.00%
1971 7.40% 8.60%
1972 5.00% 0.00%
1973 72.70% 0.00%
1974 9.40% 0.00%
1975 46.50% 0.90%
1976 20.80% 0.00%
1977 0.00% 1.80%
1978 14.60% 0.00%
1979 23.20% 0.00%
1980 30.70% 0.00%
1981 0.00% 34.90%
1982 2.70% 0.00%
1983 52.90% 0.00%
1984 52.90% 0.00%
1985 0.00% 38.50%
1986 0.00% 38.00%
1987 0.00% 0.00%
1988 0.00% 24.30%
1989 7.40% 4.60%
1990 24.60% 4.60%
1991 15.70% 0.00%
1992 0.00% 0.00%
1993 6.70% 0.00%
1994 4.40% 0.00%
1995 3.10% 4.70%
1996 17.40% 0.00%
1997 7.00% 0.00%
1998 42.40% 0.00%
1999 0.00% 41.70%
2000 0.00% 41.70%
2001 0.00% 33.50%
2002 0.00% 52.80%
2003 31.30% 0.00%
2004 8.80% 0.00%
2005 0.00% 0.00%
2006 0.00% 10.40%
2007 0.00% 55.60%
2008 0.00% 58.20%
2009 0.00% 4.80%
2010 1.40% 0.00%
2011 0.00% 28.60%
2012 0.00% 58.40%
2013 2.60% 2.70%
2014 39.00% 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.