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 20.36%
1911 26.96%
1912 35.88%
1913 16.76%
1914 17.78%
1915 21.58%
1916 26.24%
1917 32.14%
1918 12.84%
1919 18.34%
1920 20.66%
1921 25.90%
1922 16.68%
1923 17.08%
1924 28.68%
1925 15.20%
1926 19.12%
1927 21.36%
1928 11.90%
1929 30.42%
1930 12.34%
1931 27.80%
1932 10.78%
1933 18.44%
1934 40.66%
1935 14.04%
1936 19.78%
1937 13.92%
1938 18.52%
1939 16.44%
1940 26.68%
1941 27.40%
1942 14.28%
1943 13.30%
1944 12.42%
1945 12.18%
1946 13.44%
1947 9.52%
1948 14.52%
1949 15.82%
1950 23.14%
1951 21.46%
1952 14.14%
1953 20.62%
1954 29.84%
1955 19.56%
1956 17.20%
1957 17.82%
1958 20.72%
1959 13.72%
1960 10.46%
1961 13.58%
1962 7.06%
1963 17.54%
1964 18.08%
1965 17.18%
1966 17.44%
1967 10.70%
1968 14.58%
1969 12.28%
1970 11.52%
1971 10.04%
1972 13.06%
1973 23.02%
1974 11.08%
1975 21.80%
1976 17.88%
1977 11.28%
1978 20.18%
1979 29.94%
1980 10.04%
1981 18.96%
1982 20.80%
1983 28.42%
1984 16.14%
1985 15.94%
1986 19.84%
1987 21.66%
1988 19.06%
1989 15.34%
1990 25.40%
1991 17.36%
1992 23.00%
1993 26.76%
1994 13.88%
1995 17.34%
1996 28.72%
1997 18.84%
1998 42.66%
1999 27.04%
2000 22.88%
2001 19.14%
2002 22.58%
2003 25.94%
2004 19.78%
2005 24.46%
2006 31.96%
2007 33.62%
2008 18.44%
2009 17.06%
2010 23.42%
2011 30.46%
2012 47.56%
2013 20.94%
2014 34.16%

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.