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 0.80% 8.30%
1911 0.40% 27.00%
1912 15.40% 0.60%
1913 7.00% 0.00%
1914 8.10% 8.20%
1915 18.00% 4.10%
1916 30.00% 0.90%
1917 12.40% 7.10%
1918 0.00% 21.50%
1919 12.50% 3.30%
1920 24.90% 0.30%
1921 5.60% 2.30%
1922 3.10% 0.30%
1923 1.50% 4.30%
1924 10.10% 7.50%
1925 0.10% 16.60%
1926 1.70% 8.00%
1927 18.80% 2.70%
1928 17.90% 0.80%
1929 19.20% 10.00%
1930 2.10% 8.40%
1931 3.50% 33.10%
1932 3.70% 8.40%
1933 0.30% 3.50%
1934 0.10% 44.10%
1935 1.10% 26.20%
1936 2.50% 15.30%
1937 2.70% 19.10%
1938 3.50% 4.60%
1939 1.50% 9.50%
1940 0.70% 23.40%
1941 24.90% 13.40%
1942 28.20% 6.60%
1943 11.90% 2.80%
1944 3.00% 5.80%
1945 8.90% 1.00%
1946 11.30% 0.30%
1947 8.20% 1.70%
1948 11.90% 3.00%
1949 6.60% 2.50%
1950 11.00% 3.70%
1951 13.10% 7.90%
1952 10.80% 9.10%
1953 2.60% 13.40%
1954 2.90% 31.10%
1955 0.70% 30.80%
1956 4.70% 33.30%
1957 1.70% 9.60%
1958 22.90% 1.20%
1959 3.00% 7.20%
1960 8.30% 7.00%
1961 6.30% 13.70%
1962 2.90% 2.00%
1963 0.00% 11.90%
1964 3.70% 19.10%
1965 9.90% 8.80%
1966 5.50% 8.80%
1967 2.10% 2.90%
1968 4.00% 2.60%
1969 10.10% 1.00%
1970 2.10% 0.20%
1971 7.20% 4.90%
1972 10.30% 3.70%
1973 45.20% 2.30%
1974 21.90% 0.30%
1975 24.10% 0.10%
1976 12.30% 3.50%
1977 1.20% 26.30%
1978 13.20% 1.70%
1979 24.10% 0.70%
1980 9.40% 4.00%
1981 1.80% 14.40%
1982 12.40% 0.50%
1983 41.00% 0.00%
1984 32.50% 1.20%
1985 16.00% 6.60%
1986 5.90% 6.70%
1987 14.50% 1.80%
1988 1.20% 20.40%
1989 4.50% 14.70%
1990 6.40% 15.20%
1991 6.00% 4.60%
1992 17.50% 11.60%
1993 29.10% 0.00%
1994 15.00% 2.80%
1995 18.90% 0.90%
1996 28.10% 7.40%
1997 28.30% 3.40%
1998 21.00% 0.20%
1999 14.20% 9.30%
2000 1.40% 21.30%
2001 3.20% 17.20%
2002 1.60% 29.20%
2003 8.30% 15.40%
2004 9.30% 12.60%
2005 16.90% 3.70%
2006 5.50% 18.10%
2007 5.40% 23.50%
2008 12.40% 11.80%
2009 15.10% 5.60%
2010 16.50% 0.00%
2011 34.80% 19.00%
2012 1.00% 18.60%
2013 3.40% 28.00%
2014 11.40% 15.60%

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.