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% 3.40%
1911 0.00% 11.10%
1912 13.70% 0.00%
1913 0.00% 1.30%
1914 0.00% 68.50%
1915 13.40% 0.00%
1916 5.60% 0.00%
1917 7.60% 0.00%
1918 0.90% 12.60%
1919 0.90% 0.00%
1920 22.80% 0.00%
1921 0.00% 2.10%
1922 0.00% 0.00%
1923 0.00% 5.40%
1924 5.60% 0.00%
1925 0.00% 31.10%
1926 1.50% 0.00%
1927 64.10% 0.00%
1928 44.50% 0.00%
1929 31.60% 0.00%
1930 0.00% 58.90%
1931 0.00% 63.60%
1932 0.00% 11.70%
1933 0.00% 1.20%
1934 0.00% 61.20%
1935 20.50% 7.70%
1936 0.00% 82.40%
1937 7.60% 0.00%
1938 2.60% 0.00%
1939 0.00% 0.00%
1940 0.00% 13.20%
1941 0.00% 64.20%
1942 4.40% 7.80%
1943 5.70% 3.10%
1944 0.00% 19.50%
1945 19.90% 0.00%
1946 0.00% 0.00%
1947 6.10% 3.80%
1948 0.00% 0.00%
1949 1.00% 0.00%
1950 53.80% 0.00%
1951 31.60% 0.00%
1952 0.00% 0.00%
1953 0.00% 34.00%
1954 0.00% 72.30%
1955 0.00% 2.40%
1956 9.10% 14.10%
1957 15.80% 4.70%
1958 29.70% 0.00%
1959 0.00% 0.90%
1960 2.30% 0.00%
1961 10.00% 0.00%
1962 0.00% 3.20%
1963 0.00% 11.90%
1964 0.00% 40.10%
1965 0.00% 14.70%
1966 0.00% 9.70%
1967 0.00% 0.00%
1968 0.00% 0.00%
1969 4.50% 2.40%
1970 0.00% 0.90%
1971 0.00% 0.00%
1972 8.60% 0.00%
1973 80.80% 0.00%
1974 31.60% 0.00%
1975 20.80% 0.00%
1976 0.00% 0.90%
1977 0.00% 1.00%
1978 0.00% 0.00%
1979 35.10% 0.00%
1980 14.50% 16.40%
1981 15.90% 0.00%
1982 19.30% 0.00%
1983 3.60% 0.00%
1984 0.00% 0.00%
1985 16.50% 0.00%
1986 0.00% 10.60%
1987 0.00% 6.70%
1988 0.00% 62.70%
1989 40.60% 3.80%
1990 33.50% 0.00%
1991 0.00% 15.50%
1992 0.00% 0.00%
1993 36.70% 0.00%
1994 19.30% 0.00%
1995 8.00% 0.00%
1996 17.30% 0.00%
1997 30.30% 0.00%
1998 11.70% 0.00%
1999 0.00% 22.00%
2000 0.00% 0.00%
2001 4.70% 0.00%
2002 0.90% 0.00%
2003 37.10% 4.70%
2004 37.00% 0.00%
2005 0.00% 5.80%
2006 1.20% 12.60%
2007 0.00% 23.80%
2008 37.90% 5.80%
2009 33.40% 0.00%
2010 25.60% 0.00%
2011 27.50% 0.00%
2012 0.00% 62.80%
2013 13.60% 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.