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% 7.50%
1912 25.10% 0.00%
1913 6.20% 0.00%
1914 0.00% 37.00%
1915 0.00% 32.00%
1916 41.90% 0.00%
1917 19.30% 3.30%
1918 0.00% 15.60%
1919 0.00% 0.00%
1920 20.70% 0.00%
1921 0.00% 10.40%
1922 1.70% 0.00%
1923 0.00% 5.40%
1924 3.50% 0.00%
1925 0.00% 25.90%
1926 0.00% 10.10%
1927 88.00% 0.00%
1928 22.50% 0.00%
1929 27.30% 0.00%
1930 0.00% 0.90%
1931 0.00% 76.00%
1932 0.00% 8.60%
1933 11.80% 0.00%
1934 0.00% 60.90%
1935 0.90% 19.20%
1936 0.00% 13.60%
1937 1.10% 0.00%
1938 7.00% 0.00%
1939 0.00% 0.00%
1940 0.00% 39.90%
1941 0.00% 82.80%
1942 0.00% 33.10%
1943 6.60% 0.00%
1944 1.20% 13.30%
1945 22.20% 1.30%
1946 6.20% 0.00%
1947 2.40% 7.40%
1948 1.60% 0.00%
1949 3.10% 0.00%
1950 51.30% 0.00%
1951 44.00% 0.00%
1952 7.20% 0.00%
1953 0.00% 23.50%
1954 0.00% 81.60%
1955 0.00% 26.70%
1956 10.10% 27.00%
1957 0.00% 4.70%
1958 1.30% 0.00%
1959 4.90% 0.00%
1960 2.30% 4.60%
1961 0.00% 0.00%
1962 2.20% 0.00%
1963 0.00% 16.90%
1964 0.00% 37.30%
1965 0.00% 20.50%
1966 2.30% 18.80%
1967 0.00% 0.00%
1968 0.00% 0.00%
1969 0.00% 8.40%
1970 0.00% 0.00%
1971 0.00% 0.00%
1972 0.00% 0.00%
1973 61.40% 0.00%
1974 51.20% 0.00%
1975 53.10% 0.00%
1976 0.00% 0.00%
1977 0.00% 25.00%
1978 0.00% 0.00%
1979 22.10% 0.00%
1980 16.00% 2.40%
1981 1.10% 13.20%
1982 11.50% 0.00%
1983 28.10% 0.00%
1984 5.50% 0.00%
1985 16.70% 5.30%
1986 0.00% 9.90%
1987 0.00% 0.00%
1988 0.00% 28.50%
1989 18.00% 13.00%
1990 12.30% 0.00%
1991 8.70% 0.00%
1992 0.00% 13.60%
1993 30.80% 0.00%
1994 37.60% 0.00%
1995 0.00% 0.00%
1996 7.70% 0.00%
1997 49.00% 0.00%
1998 8.50% 0.00%
1999 4.70% 14.20%
2000 0.00% 47.20%
2001 0.00% 4.30%
2002 28.70% 0.00%
2003 5.40% 7.30%
2004 23.80% 0.00%
2005 4.90% 0.00%
2006 0.00% 21.70%
2007 10.30% 10.50%
2008 35.80% 9.90%
2009 33.80% 1.50%
2010 26.60% 0.00%
2011 32.20% 0.00%
2012 1.10% 4.40%
2013 6.00% 0.00%
2014 2.30% 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.