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% 65.30%
1911 0.00% 53.10%
1912 8.70% 0.00%
1913 5.00% 0.00%
1914 4.00% 4.70%
1915 21.30% 0.00%
1916 19.60% 0.00%
1917 4.00% 0.00%
1918 0.00% 24.90%
1919 4.90% 4.00%
1920 2.40% 0.00%
1921 0.00% 4.90%
1922 2.60% 8.90%
1923 0.00% 20.30%
1924 8.80% 12.80%
1925 0.00% 19.90%
1926 0.00% 2.70%
1927 2.10% 0.00%
1928 10.20% 0.00%
1929 1.90% 0.00%
1930 0.00% 11.40%
1931 0.00% 79.20%
1932 0.00% 11.90%
1933 0.00% 26.90%
1934 0.00% 97.30%
1935 6.70% 7.50%
1936 0.00% 43.00%
1937 5.20% 29.20%
1938 19.00% 4.10%
1939 0.00% 5.20%
1940 2.10% 15.60%
1941 0.00% 1.70%
1942 9.10% 0.00%
1943 5.50% 0.00%
1944 33.50% 0.00%
1945 34.50% 0.00%
1946 2.10% 0.00%
1947 2.60% 0.00%
1948 0.00% 19.60%
1949 0.00% 7.30%
1950 27.20% 0.00%
1951 45.70% 0.00%
1952 27.80% 0.00%
1953 19.30% 2.60%
1954 12.00% 6.30%
1955 0.00% 9.60%
1956 2.60% 26.70%
1957 7.80% 10.60%
1958 0.00% 6.90%
1959 0.00% 4.00%
1960 27.80% 0.00%
1961 0.00% 14.60%
1962 14.10% 0.00%
1963 0.00% 12.20%
1964 0.00% 26.70%
1965 9.50% 2.60%
1966 10.40% 1.90%
1967 9.90% 0.00%
1968 22.40% 2.70%
1969 18.60% 0.00%
1970 0.00% 3.70%
1971 2.70% 4.30%
1972 11.40% 0.00%
1973 38.70% 0.00%
1974 16.30% 0.00%
1975 14.50% 0.00%
1976 0.00% 10.00%
1977 0.00% 19.90%
1978 12.30% 0.00%
1979 32.60% 0.00%
1980 0.00% 10.40%
1981 4.40% 9.50%
1982 6.30% 0.00%
1983 20.70% 0.00%
1984 13.20% 0.00%
1985 24.30% 0.00%
1986 29.40% 0.00%
1987 2.00% 17.60%
1988 0.00% 73.40%
1989 0.00% 42.70%
1990 15.70% 5.20%
1991 15.80% 0.00%
1992 2.50% 0.00%
1993 71.30% 0.00%
1994 22.40% 0.00%
1995 5.10% 0.00%
1996 22.50% 0.00%
1997 6.80% 0.00%
1998 19.20% 8.30%
1999 19.30% 1.70%
2000 5.40% 2.70%
2001 0.00% 0.00%
2002 11.90% 0.00%
2003 0.00% 1.20%
2004 17.30% 0.00%
2005 11.50% 10.50%
2006 0.00% 7.00%
2007 0.00% 27.10%
2008 28.60% 0.00%
2009 34.20% 2.40%
2010 37.90% 0.00%
2011 18.60% 0.00%
2012 0.00% 33.70%
2013 34.20% 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.