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% 9.60%
1911 0.00% 5.00%
1912 5.10% 0.00%
1913 5.00% 0.00%
1914 26.20% 0.00%
1915 72.90% 0.00%
1916 41.70% 0.00%
1917 8.70% 0.00%
1918 0.00% 0.00%
1919 34.20% 0.00%
1920 49.10% 0.00%
1921 8.30% 0.00%
1922 5.20% 4.50%
1923 13.50% 0.00%
1924 5.60% 0.00%
1925 0.00% 5.70%
1926 0.00% 0.00%
1927 13.30% 0.00%
1928 9.10% 0.00%
1929 0.00% 3.10%
1930 0.00% 0.00%
1931 20.80% 0.00%
1932 25.80% 0.00%
1933 0.00% 5.00%
1934 0.00% 71.40%
1935 0.00% 26.30%
1936 0.00% 8.70%
1937 0.00% 7.00%
1938 0.00% 0.00%
1939 0.00% 0.00%
1940 0.00% 0.00%
1941 89.00% 0.00%
1942 37.60% 0.00%
1943 8.70% 0.00%
1944 6.60% 0.00%
1945 0.00% 0.00%
1946 0.00% 1.80%
1947 17.80% 5.50%
1948 6.60% 8.90%
1949 0.00% 0.00%
1950 0.00% 10.80%
1951 0.00% 21.70%
1952 1.10% 7.40%
1953 0.00% 13.90%
1954 0.00% 50.60%
1955 0.00% 20.60%
1956 0.00% 75.70%
1957 14.10% 0.00%
1958 23.70% 0.00%
1959 0.00% 9.50%
1960 3.50% 9.30%
1961 3.50% 1.90%
1962 0.00% 0.00%
1963 0.00% 30.70%
1964 0.00% 17.10%
1965 38.50% 5.20%
1966 0.00% 0.00%
1967 0.00% 0.00%
1968 0.00% 0.00%
1969 0.00% 0.00%
1970 6.80% 0.00%
1971 1.30% 4.50%
1972 0.00% 0.00%
1973 23.40% 0.00%
1974 0.00% 0.00%
1975 0.00% 0.00%
1976 0.00% 0.00%
1977 0.00% 24.50%
1978 8.80% 0.00%
1979 36.60% 0.00%
1980 8.50% 0.00%
1981 0.00% 2.40%
1982 4.00% 0.00%
1983 66.20% 0.00%
1984 37.60% 0.00%
1985 76.10% 0.00%
1986 36.70% 0.00%
1987 28.60% 0.00%
1988 0.00% 1.30%
1989 0.00% 30.10%
1990 0.00% 29.10%
1991 4.50% 0.00%
1992 48.70% 0.00%
1993 38.80% 0.00%
1994 0.00% 0.00%
1995 6.00% 0.00%
1996 0.00% 26.80%
1997 14.40% 4.60%
1998 25.40% 0.00%
1999 0.00% 0.00%
2000 0.00% 28.60%
2001 0.00% 11.70%
2002 0.00% 77.60%
2003 0.00% 75.40%
2004 0.00% 0.00%
2005 20.40% 0.00%
2006 0.00% 24.50%
2007 0.00% 28.10%
2008 0.00% 0.00%
2009 0.00% 18.30%
2010 0.00% 0.00%
2011 11.90% 37.30%
2012 0.00% 84.90%
2013 0.00% 53.50%

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.