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 20.56%
1911 23.12%
1912 25.52%
1913 14.60%
1914 18.18%
1915 28.02%
1916 19.22%
1917 28.30%
1918 17.84%
1919 20.96%
1920 25.78%
1921 20.60%
1922 10.80%
1923 17.28%
1924 32.32%
1925 21.94%
1926 17.14%
1927 22.26%
1928 26.14%
1929 14.94%
1930 16.18%
1931 23.88%
1932 10.18%
1933 17.40%
1934 37.92%
1935 12.02%
1936 33.26%
1937 14.48%
1938 11.32%
1939 15.10%
1940 20.60%
1941 35.78%
1942 15.74%
1943 10.58%
1944 12.44%
1945 22.32%
1946 9.04%
1947 9.08%
1948 17.44%
1949 12.46%
1950 29.06%
1951 24.48%
1952 13.00%
1953 19.30%
1954 28.24%
1955 22.62%
1956 22.00%
1957 14.50%
1958 16.02%
1959 13.42%
1960 10.82%
1961 20.92%
1962 6.60%
1963 19.18%
1964 16.02%
1965 25.34%
1966 14.42%
1967 21.32%
1968 14.60%
1969 8.12%
1970 8.14%
1971 10.38%
1972 10.46%
1973 21.40%
1974 14.80%
1975 23.00%
1976 20.98%
1977 19.22%
1978 13.76%
1979 17.24%
1980 18.32%
1981 12.62%
1982 13.40%
1983 22.22%
1984 16.72%
1985 10.04%
1986 15.46%
1987 19.28%
1988 23.98%
1989 19.20%
1990 15.40%
1991 23.66%
1992 32.04%
1993 25.62%
1994 16.84%
1995 19.74%
1996 19.12%
1997 25.18%
1998 33.74%
1999 18.76%
2000 21.52%
2001 23.32%
2002 25.72%
2003 21.98%
2004 17.82%
2005 19.68%
2006 28.40%
2007 33.06%
2008 16.86%
2009 19.08%
2010 35.00%
2011 38.84%
2012 37.80%
2013 27.08%

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.