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.

Year Percent
1910 18.80%
1911 10.60%
1912 17.50%
1913 13.30%
1914 0.40%
1915 47.60%
1916 60.10%
1917 3.70%
1918 12.50%
1919 29.90%
1920 10.60%
1921 20.10%
1922 0.00%
1923 13.90%
1924 11.80%
1925 6.20%
1926 46.50%
1927 0.00%
1928 31.20%
1929 17.10%
1930 0.00%
1931 0.00%
1932 36.10%
1933 65.30%
1934 16.80%
1935 26.90%
1936 21.90%
1937 3.90%
1938 16.60%
1939 9.50%
1940 13.10%
1941 36.80%
1942 14.90%
1943 8.10%
1944 31.20%
1945 30.90%
1946 8.50%
1947 57.10%
1948 36.70%
1949 29.30%
1950 48.30%
1951 0.00%
1952 10.00%
1953 27.50%
1954 39.40%
1955 33.40%
1956 2.90%
1957 27.30%
1958 0.00%
1959 31.50%
1960 46.10%
1961 23.90%
1962 0.00%
1963 0.00%
1964 59.30%
1965 39.30%
1966 12.60%
1967 23.80%
1968 11.40%
1969 35.00%
1970 24.90%
1971 23.00%
1972 11.10%
1973 0.70%
1974 12.40%
1975 10.50%
1976 12.80%
1977 1.10%
1978 0.00%
1979 34.10%
1980 9.80%
1981 3.10%
1982 0.00%
1983 13.10%
1984 6.10%
1985 73.70%
1986 7.40%
1987 0.00%
1988 9.40%
1989 30.70%
1990 0.00%
1991 20.10%
1992 42.60%
1993 9.30%
1994 7.00%
1995 34.50%
1996 25.70%
1997 6.40%
1998 46.70%
1999 34.30%
2000 0.00%
2001 6.50%
2002 30.10%
2003 20.30%
2004 81.30%
2005 93.60%
2006 3.10%
2007 8.90%
2008 52.20%
2009 0.00%
2010 0.00%
2011 14.40%
2012 3.90%
2013 0.00%

**As of December 2005, landfalling wind speeds in the sixth indicator are determined using the following logic:

  1. For landfalls prior to 1915: Use wind speed observation prior to landfall as landfalling windspeed.
  2. For landfalls from 1915 to 1930: Use wind speed observation prior to landfall if observation was at 12Z. Otherwise use midpoint windspeed value from assigned landfalling Saffir-Simpson Scale.
  3. For landfalls from 1931 to 1979: Use wind speed observation prior to landfall if observation was at either 0Z or 12Z. Otherwise use midpoint windspeed value from assigned landfalling Saffir-Simpson Scale.
  4. For landfalls from 1980 to the present: Use estimated landfalling windspeed as reproted in the Tropical Cyclone Reports issued by the National Hurricane Center.

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.