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 17.98%
1911 31.14%
1912 32.62%
1913 19.62%
1914 17.86%
1915 19.94%
1916 27.64%
1917 33.84%
1918 14.40%
1919 13.28%
1920 22.42%
1921 24.96%
1922 21.88%
1923 12.78%
1924 25.28%
1925 21.24%
1926 23.02%
1927 17.70%
1928 10.90%
1929 29.18%
1930 8.34%
1931 25.28%
1932 11.44%
1933 20.34%
1934 38.38%
1935 12.66%
1936 20.48%
1937 24.44%
1938 16.86%
1939 9.62%
1940 31.50%
1941 23.70%
1942 18.40%
1943 12.34%
1944 14.16%
1945 12.00%
1946 15.84%
1947 14.42%
1948 12.02%
1949 22.94%
1950 22.58%
1951 15.62%
1952 14.84%
1953 20.40%
1954 21.56%
1955 20.56%
1956 12.58%
1957 16.90%
1958 25.26%
1959 9.08%
1960 17.58%
1961 15.06%
1962 7.26%
1963 11.18%
1964 19.22%
1965 12.88%
1966 15.50%
1967 11.10%
1968 11.92%
1969 11.90%
1970 10.22%
1971 12.12%
1972 15.88%
1973 25.48%
1974 16.70%
1975 19.36%
1976 11.14%
1977 14.06%
1978 29.38%
1979 33.38%
1980 13.66%
1981 19.92%
1982 15.32%
1983 28.82%
1984 18.14%
1985 14.14%
1986 25.86%
1987 26.10%
1988 18.44%
1989 12.58%
1990 25.98%
1991 25.20%
1992 28.88%
1993 21.44%
1994 15.02%
1995 15.58%
1996 24.64%
1997 18.20%
1998 31.72%
1999 21.02%
2000 34.82%
2001 13.46%
2002 21.92%
2003 16.78%
2004 17.98%
2005 18.24%
2006 36.72%
2007 22.80%
2008 18.20%
2009 13.66%
2010 19.48%
2011 29.66%
2012 45.54%
2013 19.04%
2014 29.44%

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.