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% 0.00%
1912 9.30% 2.00%
1913 12.30% 0.00%
1914 3.30% 0.00%
1915 0.00% 8.90%
1916 44.80% 0.00%
1917 7.40% 0.00%
1918 0.00% 3.40%
1919 0.00% 0.00%
1920 0.00% 0.00%
1921 36.00% 0.00%
1922 2.00% 0.00%
1923 0.00% 3.80%
1924 0.00% 22.60%
1925 0.00% 0.00%
1926 0.00% 36.40%
1927 6.50% 0.00%
1928 2.80% 0.00%
1929 0.00% 69.30%
1930 0.00% 40.50%
1931 0.00% 67.70%
1932 2.00% 0.00%
1933 0.00% 11.90%
1934 0.00% 45.40%
1935 0.00% 29.40%
1936 0.00% 8.30%
1937 0.00% 20.50%
1938 2.50% 0.00%
1939 0.00% 39.50%
1940 0.00% 3.60%
1941 0.00% 12.40%
1942 25.90% 2.20%
1943 34.60% 0.00%
1944 0.00% 21.90%
1945 0.00% 0.70%
1946 5.20% 0.00%
1947 0.00% 4.80%
1948 34.40% 0.00%
1949 0.70% 0.00%
1950 12.40% 0.00%
1951 13.20% 0.00%
1952 0.00% 2.00%
1953 0.00% 0.00%
1954 0.00% 8.50%
1955 0.00% 9.30%
1956 25.20% 0.00%
1957 19.50% 0.00%
1958 14.30% 0.00%
1959 0.00% 2.00%
1960 4.80% 0.00%
1961 19.40% 5.30%
1962 0.00% 2.00%
1963 0.00% 0.00%
1964 0.00% 0.00%
1965 25.50% 0.00%
1966 0.00% 8.40%
1967 0.00% 0.00%
1968 2.00% 28.40%
1969 3.30% 0.00%
1970 0.00% 0.00%
1971 37.60% 0.00%
1972 32.80% 0.00%
1973 0.00% 27.90%
1974 40.70% 0.00%
1975 0.00% 0.00%
1976 16.20% 0.00%
1977 0.00% 72.90%
1978 2.00% 0.00%
1979 0.00% 2.80%
1980 0.00% 0.00%
1981 0.00% 0.00%
1982 65.20% 0.00%
1983 85.60% 0.00%
1984 78.70% 0.00%
1985 11.90% 3.40%
1986 5.20% 0.00%
1987 0.00% 22.60%
1988 0.00% 32.60%
1989 0.00% 0.00%
1990 0.00% 16.10%
1991 0.70% 31.40%
1992 0.00% 85.60%
1993 0.00% 0.00%
1994 0.00% 27.00%
1995 10.90% 0.00%
1996 94.40% 0.00%
1997 89.60% 0.00%
1998 15.50% 0.00%
1999 29.10% 0.00%
2000 0.00% 0.00%
2001 0.00% 71.40%
2002 0.00% 10.50%
2003 0.00% 13.80%
2004 0.00% 20.30%
2005 0.00% 13.90%
2006 11.30% 0.00%
2007 0.00% 4.00%
2008 0.00% 0.00%
2009 0.00% 0.00%
2010 0.00% 0.00%
2011 90.00% 0.00%
2012 6.30% 0.00%
2013 0.00% 10.00%
2014 9.00% 12.70%

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.