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 11.58%
1911 10.44%
1912 17.68%
1913 19.32%
1914 19.42%
1915 17.86%
1916 13.38%
1917 26.18%
1918 26.48%
1919 2.88%
1920 14.82%
1921 38.52%
1922 17.78%
1923 24.56%
1924 36.06%
1925 21.86%
1926 35.66%
1927 34.42%
1928 22.70%
1929 15.96%
1930 6.42%
1931 32.40%
1932 17.58%
1933 11.18%
1934 29.40%
1935 13.54%
1936 17.60%
1937 5.46%
1938 24.10%
1939 14.42%
1940 33.12%
1941 29.66%
1942 13.90%
1943 19.36%
1944 11.48%
1945 22.88%
1946 29.82%
1947 42.20%
1948 4.76%
1949 2.40%
1950 27.78%
1951 15.62%
1952 7.72%
1953 11.06%
1954 21.34%
1955 17.48%
1956 18.64%
1957 6.16%
1958 14.06%
1959 3.36%
1960 43.42%
1961 18.64%
1962 3.88%
1963 12.08%
1964 22.32%
1965 4.72%
1966 9.52%
1967 8.76%
1968 5.20%
1969 13.62%
1970 10.22%
1971 25.56%
1972 3.48%
1973 38.16%
1974 21.22%
1975 15.10%
1976 7.18%
1977 51.28%
1978 10.84%
1979 11.94%
1980 8.08%
1981 6.44%
1982 4.44%
1983 33.30%
1984 38.44%
1985 36.26%
1986 19.44%
1987 26.74%
1988 19.18%
1989 10.70%
1990 15.24%
1991 41.54%
1992 9.28%
1993 18.04%
1994 22.20%
1995 13.60%
1996 28.74%
1997 20.58%
1998 24.12%
1999 7.96%
2000 26.48%
2001 4.92%
2002 19.52%
2003 9.94%
2004 39.48%
2005 7.40%
2006 16.02%
2007 37.24%
2008 25.58%
2009 19.18%
2010 43.08%
2011 29.54%
2012 51.02%
2013 22.92%

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.