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 0.00% 0.00%
1912 0.00% 0.00%
1913 0.00% 0.00%
1914 17.80% 0.00%
1915 26.10% 0.00%
1916 42.30% 0.00%
1917 12.60% 0.00%
1918 0.00% 0.00%
1919 0.00% 0.00%
1920 3.60% 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% 12.60%
1929 0.00% 23.00%
1930 0.00% 0.00%
1931 0.00% 18.10%
1932 0.00% 0.00%
1933 0.00% 0.00%
1934 0.00% 41.10%
1935 0.00% 0.00%
1936 0.00% 0.00%
1937 0.00% 0.00%
1938 36.20% 0.00%
1939 0.00% 18.10%
1940 8.00% 0.00%
1941 86.20% 0.00%
1942 43.20% 0.00%
1943 0.00% 0.00%
1944 0.00% 0.00%
1945 24.80% 0.00%
1946 13.50% 0.00%
1947 0.00% 0.00%
1948 0.00% 0.00%
1949 0.00% 0.00%
1950 0.00% 29.50%
1951 0.00% 12.60%
1952 33.50% 0.00%
1953 8.00% 0.00%
1954 0.00% 13.50%
1955 0.00% 0.00%
1956 10.10% 3.60%
1957 0.00% 0.00%
1958 34.30% 0.00%
1959 0.00% 58.90%
1960 0.00% 56.10%
1961 0.00% 26.10%
1962 0.00% 0.00%
1963 2.50% 3.60%
1964 0.00% 3.60%
1965 2.50% 0.00%
1966 0.00% 0.00%
1967 2.50% 0.00%
1968 0.00% 0.00%
1969 26.10% 0.00%
1970 0.00% 0.00%
1971 27.30% 17.00%
1972 0.00% 0.00%
1973 3.90% 0.00%
1974 0.00% 0.00%
1975 0.00% 0.00%
1976 0.00% 34.30%
1977 0.00% 18.70%
1978 50.70% 0.00%
1979 33.20% 0.00%
1980 20.60% 0.00%
1981 0.00% 0.00%
1982 50.30% 0.00%
1983 100.00% 0.00%
1984 37.40% 5.20%
1985 0.00% 0.00%
1986 0.00% 0.00%
1987 0.00% 20.50%
1988 0.00% 10.10%
1989 0.00% 25.80%
1990 0.00% 51.00%
1991 0.00% 0.00%
1992 3.60% 27.30%
1993 3.60% 0.00%
1994 0.00% 0.00%
1995 48.10% 0.00%
1996 44.20% 20.60%
1997 42.90% 0.00%
1998 100.00% 0.00%
1999 0.00% 0.00%
2000 0.00% 17.00%
2001 0.00% 45.40%
2002 0.00% 40.90%
2003 0.00% 29.70%
2004 0.00% 0.00%
2005 78.20% 0.00%
2006 0.00% 0.00%
2007 0.00% 100.00%
2008 0.00% 53.30%
2009 0.00% 5.20%
2010 0.00% 0.00%
2011 0.00% 0.00%
2012 0.00% 37.10%
2013 0.00% 83.80%

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.