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% 4.90%
1911 0.00% 10.40%
1912 24.00% 0.00%
1913 11.00% 2.40%
1914 0.00% 1.50%
1915 23.70% 0.00%
1916 60.00% 0.00%
1917 10.40% 0.00%
1918 0.00% 0.00%
1919 0.00% 14.60%
1920 19.20% 0.80%
1921 0.00% 0.80%
1922 0.00% 1.00%
1923 14.30% 0.00%
1924 28.30% 0.00%
1925 0.80% 0.00%
1926 5.00% 3.60%
1927 44.90% 0.00%
1928 41.40% 0.00%
1929 14.20% 5.20%
1930 5.60% 0.00%
1931 0.00% 31.20%
1932 0.00% 2.00%
1933 0.00% 5.80%
1934 0.00% 84.40%
1935 0.00% 51.00%
1936 0.00% 74.90%
1937 0.00% 75.20%
1938 3.20% 12.50%
1939 0.00% 34.30%
1940 0.00% 39.20%
1941 0.00% 0.00%
1942 27.00% 0.00%
1943 9.30% 1.20%
1944 13.10% 5.20%
1945 11.30% 0.00%
1946 11.60% 0.00%
1947 24.20% 0.00%
1948 18.80% 0.00%
1949 0.00% 0.00%
1950 7.50% 0.00%
1951 22.10% 0.00%
1952 1.40% 3.90%
1953 4.70% 0.00%
1954 4.70% 18.00%
1955 0.00% 30.30%
1956 0.00% 20.40%
1957 0.00% 0.00%
1958 0.00% 6.70%
1959 5.20% 0.00%
1960 1.40% 8.90%
1961 0.00% 23.00%
1962 0.80% 0.00%
1963 0.00% 5.70%
1964 0.00% 0.00%
1965 20.00% 0.00%
1966 8.80% 2.40%
1967 0.00% 0.00%
1968 6.70% 0.00%
1969 6.70% 0.00%
1970 3.70% 0.00%
1971 7.20% 0.00%
1972 15.40% 0.00%
1973 13.40% 0.00%
1974 3.20% 1.60%
1975 31.40% 0.00%
1976 5.70% 12.10%
1977 0.00% 5.80%
1978 30.40% 0.00%
1979 1.40% 0.00%
1980 0.00% 16.70%
1981 0.00% 16.20%
1982 16.20% 0.00%
1983 38.50% 0.00%
1984 21.40% 4.70%
1985 1.60% 0.00%
1986 14.30% 0.00%
1987 3.00% 0.00%
1988 0.00% 55.30%
1989 0.00% 43.00%
1990 0.00% 30.30%
1991 0.00% 5.30%
1992 0.00% 2.80%
1993 22.20% 0.00%
1994 30.50% 0.00%
1995 42.60% 0.00%
1996 33.10% 0.00%
1997 38.60% 0.00%
1998 17.40% 0.00%
1999 25.70% 0.00%
2000 10.30% 16.50%
2001 0.00% 38.30%
2002 0.00% 36.80%
2003 0.00% 19.80%
2004 0.00% 30.30%
2005 2.70% 1.40%
2006 0.00% 8.90%
2007 1.60% 20.40%
2008 7.40% 0.00%
2009 35.00% 0.00%
2010 53.10% 0.00%
2011 51.60% 0.00%
2012 0.00% 28.60%
2013 10.10% 23.50%

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.