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% 0.00%
1911 16.50% 0.00%
1912 0.00% 0.00%
1913 0.00% 0.00%
1914 24.80% 0.00%
1915 5.20% 0.00%
1916 0.00% 0.00%
1917 0.00% 0.00%
1918 0.00% 8.00%
1919 0.00% 0.00%
1920 0.00% 0.00%
1921 0.00% 0.00%
1922 22.20% 0.00%
1923 0.00% 0.00%
1924 0.00% 36.80%
1925 0.00% 0.00%
1926 0.00% 0.00%
1927 0.00% 0.00%
1928 0.00% 0.00%
1929 0.00% 18.10%
1930 0.00% 11.40%
1931 0.00% 29.40%
1932 0.00% 0.00%
1933 0.00% 0.00%
1934 0.00% 76.70%
1935 0.00% 0.00%
1936 0.00% 0.00%
1937 17.00% 0.00%
1938 30.10% 0.00%
1939 0.00% 18.10%
1940 8.00% 0.00%
1941 60.40% 0.00%
1942 34.00% 0.00%
1943 13.50% 0.00%
1944 0.00% 0.00%
1945 0.00% 0.00%
1946 13.50% 0.00%
1947 0.00% 18.10%
1948 0.00% 0.00%
1949 0.00% 0.00%
1950 0.00% 12.60%
1951 0.00% 33.20%
1952 42.60% 0.00%
1953 0.00% 0.00%
1954 0.00% 13.50%
1955 0.00% 24.80%
1956 0.00% 0.00%
1957 0.00% 3.60%
1958 39.50% 0.00%
1959 0.00% 28.90%
1960 0.00% 58.90%
1961 0.00% 22.60%
1962 0.00% 0.00%
1963 0.00% 3.60%
1964 0.00% 0.00%
1965 0.00% 0.00%
1966 0.00% 0.00%
1967 2.50% 0.00%
1968 0.00% 0.00%
1969 32.60% 0.00%
1970 0.00% 0.00%
1971 0.00% 0.00%
1972 0.00% 33.20%
1973 20.20% 0.00%
1974 8.00% 0.00%
1975 0.00% 0.00%
1976 0.00% 28.80%
1977 0.00% 53.60%
1978 54.60% 0.00%
1979 33.20% 0.00%
1980 20.60% 0.00%
1981 0.00% 0.00%
1982 32.80% 0.00%
1983 100.00% 0.00%
1984 37.40% 5.20%
1985 0.00% 8.00%
1986 0.00% 0.00%
1987 0.00% 2.50%
1988 0.00% 20.50%
1989 0.00% 0.00%
1990 0.00% 42.30%
1991 0.00% 13.50%
1992 20.60% 27.30%
1993 20.60% 0.00%
1994 0.00% 0.00%
1995 69.60% 0.00%
1996 45.40% 20.60%
1997 11.40% 20.60%
1998 97.50% 0.00%
1999 0.00% 0.00%
2000 0.00% 17.00%
2001 0.00% 2.50%
2002 0.00% 38.40%
2003 0.00% 26.10%
2004 0.00% 0.00%
2005 68.10% 0.00%
2006 48.10% 0.00%
2007 0.00% 86.50%
2008 0.00% 23.90%
2009 0.00% 21.40%
2010 0.00% 0.00%
2011 49.70% 0.00%
2012 0.00% 0.00%
2013 0.00% 89.90%

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.