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 3.90% 0.00%
1912 5.20% 0.00%
1913 0.00% 0.00%
1914 12.60% 0.00%
1915 42.00% 0.00%
1916 0.00% 0.00%
1917 12.60% 0.00%
1918 0.00% 8.00%
1919 0.00% 0.00%
1920 3.60% 0.00%
1921 0.00% 0.00%
1922 25.80% 0.00%
1923 0.00% 0.00%
1924 0.00% 48.10%
1925 0.00% 0.00%
1926 0.00% 0.00%
1927 0.00% 0.00%
1928 0.00% 0.00%
1929 0.00% 3.60%
1930 0.00% 0.00%
1931 0.00% 24.80%
1932 0.00% 0.00%
1933 0.00% 0.00%
1934 0.00% 70.30%
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 0.00% 0.00%
1941 73.90% 0.00%
1942 38.00% 0.00%
1943 0.00% 0.00%
1944 0.00% 0.00%
1945 24.80% 0.00%
1946 0.00% 0.00%
1947 0.00% 0.00%
1948 18.10% 0.00%
1949 0.00% 0.00%
1950 0.00% 12.60%
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 0.00% 0.00%
1957 0.00% 0.00%
1958 42.00% 0.00%
1959 0.00% 49.70%
1960 0.00% 28.60%
1961 0.00% 5.20%
1962 0.00% 0.00%
1963 2.50% 3.60%
1964 0.00% 0.00%
1965 13.50% 0.00%
1966 0.00% 10.10%
1967 32.20% 0.00%
1968 0.00% 0.00%
1969 0.00% 0.00%
1970 0.00% 0.00%
1971 27.30% 0.00%
1972 0.00% 20.90%
1973 0.00% 0.00%
1974 0.00% 0.00%
1975 0.00% 0.00%
1976 0.00% 26.30%
1977 0.00% 18.70%
1978 54.60% 0.00%
1979 33.20% 0.00%
1980 33.20% 0.00%
1981 0.00% 0.00%
1982 14.80% 0.00%
1983 100.00% 0.00%
1984 24.80% 5.20%
1985 0.00% 18.10%
1986 0.00% 0.00%
1987 0.00% 23.30%
1988 0.00% 0.00%
1989 0.00% 3.60%
1990 0.00% 26.10%
1991 0.00% 0.00%
1992 20.60% 27.30%
1993 18.10% 0.00%
1994 0.00% 3.60%
1995 79.40% 0.00%
1996 31.90% 20.60%
1997 11.40% 36.80%
1998 100.00% 0.00%
1999 0.00% 0.00%
2000 0.00% 17.00%
2001 0.00% 45.40%
2002 0.00% 48.90%
2003 0.00% 12.60%
2004 0.00% 7.70%
2005 86.20% 0.00%
2006 0.00% 0.00%
2007 0.00% 100.00%
2008 0.00% 36.80%
2009 0.00% 5.20%
2010 0.00% 0.00%
2011 36.20% 0.00%
2012 0.00% 24.80%
2013 0.00% 75.80%
2014 0.00% 86.50%

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.