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% 65.30%
1911 0.00% 53.10%
1912 8.70% 0.00%
1913 5.00% 0.00%
1914 4.00% 4.70%
1915 21.30% 0.00%
1916 11.70% 0.00%
1917 4.00% 0.00%
1918 0.00% 24.90%
1919 4.90% 4.00%
1920 2.40% 0.00%
1921 0.00% 4.90%
1922 2.60% 8.90%
1923 0.00% 20.30%
1924 8.80% 12.80%
1925 0.00% 19.90%
1926 0.00% 2.70%
1927 2.10% 0.00%
1928 10.20% 0.00%
1929 1.90% 0.00%
1930 0.00% 11.40%
1931 0.00% 79.20%
1932 0.00% 11.90%
1933 0.00% 26.90%
1934 0.00% 97.30%
1935 6.70% 7.50%
1936 0.00% 43.00%
1937 5.20% 29.20%
1938 19.00% 4.10%
1939 0.00% 5.20%
1940 2.10% 15.60%
1941 0.00% 1.70%
1942 9.10% 0.00%
1943 5.50% 0.00%
1944 33.50% 0.00%
1945 30.60% 0.00%
1946 2.10% 0.00%
1947 2.60% 0.00%
1948 0.00% 19.60%
1949 0.00% 7.30%
1950 27.20% 0.00%
1951 45.70% 0.00%
1952 26.00% 0.00%
1953 19.30% 2.60%
1954 9.20% 6.30%
1955 0.00% 9.60%
1956 2.60% 26.70%
1957 4.00% 10.60%
1958 0.00% 6.90%
1959 0.00% 4.00%
1960 27.80% 0.00%
1961 0.00% 14.60%
1962 14.10% 0.00%
1963 0.00% 12.20%
1964 0.00% 26.70%
1965 5.50% 2.60%
1966 10.40% 1.90%
1967 8.10% 0.00%
1968 22.40% 2.70%
1969 18.60% 0.00%
1970 0.00% 3.70%
1971 2.70% 4.30%
1972 11.40% 0.00%
1973 36.10% 0.00%
1974 16.30% 0.00%
1975 14.50% 0.00%
1976 0.00% 10.00%
1977 0.00% 19.90%
1978 12.30% 0.00%
1979 32.60% 0.00%
1980 0.00% 10.40%
1981 4.40% 9.50%
1982 6.30% 0.00%
1983 20.70% 0.00%
1984 10.90% 0.00%
1985 24.30% 0.00%
1986 29.40% 0.00%
1987 2.00% 17.60%
1988 0.00% 73.40%
1989 0.00% 42.70%
1990 14.50% 5.20%
1991 8.50% 0.00%
1992 2.50% 0.00%
1993 71.30% 0.00%
1994 22.40% 0.00%
1995 5.10% 0.00%
1996 18.50% 0.00%
1997 6.80% 0.00%
1998 19.20% 8.30%
1999 19.30% 1.70%
2000 7.60% 2.70%
2001 0.00% 0.00%
2002 11.90% 0.00%
2003 0.00% 1.20%
2004 17.30% 0.00%
2005 11.50% 10.50%
2006 0.00% 7.00%
2007 0.00% 27.10%
2008 24.50% 0.00%
2009 34.20% 2.40%
2010 37.90% 0.00%
2011 16.70% 0.00%
2012 0.00% 33.70%
2013 34.20% 0.00%
2014 47.30% 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.