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 18.36%
1911 13.56%
1912 18.32%
1913 11.28%
1914 23.62%
1915 13.40%
1916 18.04%
1917 9.86%
1918 18.90%
1919 16.52%
1920 18.42%
1921 10.00%
1922 16.18%
1923 12.40%
1924 8.78%
1925 37.76%
1926 15.76%
1927 25.16%
1928 23.02%
1929 23.72%
1930 35.46%
1931 17.44%
1932 17.28%
1933 6.46%
1934 25.28%
1935 3.52%
1936 20.50%
1937 6.14%
1938 6.96%
1939 15.08%
1940 11.58%
1941 14.06%
1942 9.50%
1943 26.34%
1944 6.68%
1945 8.82%
1946 21.36%
1947 16.96%
1948 9.40%
1949 21.44%
1950 15.98%
1951 10.54%
1952 30.04%
1953 11.34%
1954 45.28%
1955 16.18%
1956 9.76%
1957 10.96%
1958 9.92%
1959 15.10%
1960 11.56%
1961 36.48%
1962 11.66%
1963 13.04%
1964 19.48%
1965 23.14%
1966 28.02%
1967 44.84%
1968 8.38%
1969 6.36%
1970 7.16%
1971 10.00%
1972 36.36%
1973 15.46%
1974 31.28%
1975 19.60%
1976 29.08%
1977 11.46%
1978 9.74%
1979 20.20%
1980 30.98%
1981 19.50%
1982 11.46%
1983 20.76%
1984 14.56%
1985 10.94%
1986 29.82%
1987 19.44%
1988 22.00%
1989 31.64%
1990 19.14%
1991 21.40%
1992 19.94%
1993 26.54%
1994 24.22%
1995 19.84%
1996 7.76%
1997 19.40%
1998 31.44%
1999 22.62%
2000 23.34%
2001 8.26%
2002 23.04%
2003 40.48%
2004 18.10%
2005 37.30%
2006 25.96%
2007 31.64%
2008 18.60%
2009 7.78%
2010 41.66%
2011 55.62%
2012 11.42%
2013 46.56%

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.