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% 15.30%
1911 0.00% 74.50%
1912 1.70% 0.00%
1913 9.00% 0.00%
1914 0.00% 12.70%
1915 0.00% 8.90%
1916 38.50% 0.00%
1917 2.10% 0.00%
1918 0.00% 18.30%
1919 4.90% 4.00%
1920 5.50% 0.00%
1921 0.00% 4.20%
1922 1.90% 4.00%
1923 0.00% 20.60%
1924 0.00% 20.60%
1925 0.00% 14.00%
1926 0.00% 0.00%
1927 18.50% 0.00%
1928 4.50% 2.00%
1929 16.10% 0.00%
1930 0.00% 8.80%
1931 0.00% 73.60%
1932 0.00% 8.80%
1933 2.60% 7.80%
1934 0.00% 81.20%
1935 0.00% 17.90%
1936 0.00% 6.40%
1937 0.00% 21.90%
1938 0.00% 4.10%
1939 10.20% 7.00%
1940 0.00% 43.00%
1941 0.00% 2.10%
1942 6.30% 0.00%
1943 23.50% 0.00%
1944 2.40% 0.00%
1945 15.40% 0.00%
1946 0.00% 0.00%
1947 3.80% 0.00%
1948 0.00% 9.10%
1949 0.00% 19.00%
1950 30.70% 7.70%
1951 28.50% 0.00%
1952 37.30% 0.00%
1953 2.70% 0.00%
1954 12.80% 10.50%
1955 0.00% 4.00%
1956 0.00% 41.40%
1957 0.00% 25.20%
1958 0.00% 12.00%
1959 0.00% 8.90%
1960 27.90% 0.00%
1961 4.60% 3.50%
1962 5.00% 0.00%
1963 0.00% 14.50%
1964 0.00% 48.80%
1965 6.10% 5.20%
1966 27.90% 0.00%
1967 6.40% 5.80%
1968 0.00% 2.70%
1969 23.10% 0.00%
1970 5.20% 3.70%
1971 9.40% 0.00%
1972 11.80% 1.20%
1973 57.90% 0.00%
1974 23.60% 0.00%
1975 7.90% 0.00%
1976 13.60% 0.00%
1977 0.00% 88.60%
1978 2.00% 0.00%
1979 51.80% 0.00%
1980 0.00% 0.00%
1981 0.00% 19.80%
1982 4.80% 0.00%
1983 61.80% 0.00%
1984 26.20% 0.00%
1985 20.80% 0.00%
1986 24.30% 0.00%
1987 2.00% 15.90%
1988 0.00% 24.20%
1989 0.00% 37.20%
1990 0.00% 11.50%
1991 21.50% 0.00%
1992 17.00% 0.00%
1993 48.10% 0.00%
1994 32.00% 0.00%
1995 15.20% 0.00%
1996 28.50% 0.00%
1997 9.20% 0.00%
1998 2.80% 2.70%
1999 9.70% 13.40%
2000 0.00% 12.00%
2001 22.80% 0.00%
2002 12.90% 0.00%
2003 0.00% 9.20%
2004 3.10% 0.00%
2005 2.50% 0.00%
2006 0.00% 4.20%
2007 2.90% 17.00%
2008 31.80% 0.00%
2009 39.90% 0.00%
2010 22.20% 22.70%
2011 59.20% 0.00%
2012 0.00% 16.60%
2013 15.50% 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.