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
1911 0.00% 22.80%
1912 7.20% 3.50%
1913 15.40% 0.60%
1914 9.10% 4.20%
1915 11.60% 7.70%
1916 28.30% 0.10%
1917 17.10% 3.50%
1918 0.30% 19.40%
1919 2.20% 0.60%
1920 22.80% 2.00%
1921 9.60% 1.00%
1922 3.40% 4.00%
1923 1.00% 4.30%
1924 14.20% 2.30%
1925 0.70% 13.60%
1926 1.20% 6.70%
1927 12.00% 3.70%
1928 18.30% 3.00%
1929 18.10% 10.30%
1930 3.90% 12.30%
1931 3.20% 27.80%
1932 3.50% 15.40%
1933 4.70% 3.10%
1934 0.50% 25.30%
1935 0.60% 40.00%
1936 3.30% 9.00%
1937 2.70% 24.10%
1938 3.30% 11.20%
1939 5.80% 8.20%
1940 0.00% 29.70%
1941 7.10% 11.40%
1942 40.60% 10.50%
1943 14.50% 2.00%
1944 0.70% 3.60%
1945 3.00% 5.80%
1946 12.50% 0.50%
1947 11.10% 2.20%
1948 12.60% 3.90%
1949 8.80% 3.60%
1950 5.30% 3.00%
1951 15.00% 10.80%
1952 18.50% 11.70%
1953 0.90% 16.20%
1954 2.10% 30.80%
1955 3.20% 40.30%
1956 5.20% 25.90%
1957 0.40% 32.90%
1958 23.60% 0.30%
1959 2.80% 4.00%
1960 8.50% 9.10%
1961 4.80% 12.20%
1962 6.80% 5.00%
1963 0.00% 6.10%
1964 0.50% 28.70%
1965 9.50% 14.00%
1966 12.00% 6.00%
1967 0.00% 5.90%
1968 3.30% 1.50%
1969 9.20% 1.40%
1970 7.70% 0.30%
1971 7.40% 0.90%
1972 12.40% 0.20%
1973 27.40% 0.00%
1974 27.50% 0.30%
1975 19.70% 0.40%
1976 17.30% 0.10%
1977 5.60% 24.60%
1978 7.00% 0.70%
1979 16.60% 0.00%
1980 17.20% 0.20%
1981 1.10% 14.00%
1982 9.20% 2.10%
1983 33.70% 0.00%
1984 30.60% 0.00%
1985 18.80% 2.80%
1986 13.70% 0.00%
1987 19.80% 0.00%
1988 5.30% 15.80%
1989 0.50% 18.90%
1990 10.80% 22.50%
1991 6.00% 13.90%
1992 14.40% 6.10%
1993 31.40% 1.50%
1994 20.60% 0.20%
1995 8.00% 0.20%
1996 27.50% 1.60%
1997 28.90% 5.20%
1998 22.60% 0.20%
1999 13.20% 5.90%
2000 2.50% 18.00%
2001 1.80% 12.40%
2002 5.70% 23.20%
2003 4.00% 28.00%
2004 11.80% 18.40%
2005 23.10% 3.70%
2006 10.60% 7.80%
2007 8.40% 12.90%
2008 5.30% 22.40%
2009 17.30% 8.00%
2010 24.00% 1.30%
2011 22.60% 8.40%
2012 3.80% 22.10%
2013 1.20% 34.90%
2014 10.50% 11.10%

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.