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 22.26%
1911 17.56%
1912 32.76%
1913 21.74%
1914 35.06%
1915 38.06%
1916 21.56%
1917 17.30%
1918 12.06%
1919 25.22%
1920 29.30%
1921 30.24%
1922 12.56%
1923 29.18%
1924 24.64%
1925 14.30%
1926 7.72%
1927 17.36%
1928 17.04%
1929 16.10%
1930 10.56%
1931 21.54%
1932 11.16%
1933 9.94%
1934 25.04%
1935 10.94%
1936 19.16%
1937 7.56%
1938 6.64%
1939 17.34%
1940 20.28%
1941 39.32%
1942 14.84%
1943 13.78%
1944 25.22%
1945 12.30%
1946 5.72%
1947 15.26%
1948 11.44%
1949 12.86%
1950 21.44%
1951 17.06%
1952 7.38%
1953 10.40%
1954 14.92%
1955 16.32%
1956 15.28%
1957 15.72%
1958 12.82%
1959 11.54%
1960 19.08%
1961 12.68%
1962 12.22%
1963 15.52%
1964 12.20%
1965 35.74%
1966 7.42%
1967 20.62%
1968 17.04%
1969 2.76%
1970 8.48%
1971 9.64%
1972 9.54%
1973 13.00%
1974 8.40%
1975 15.74%
1976 9.88%
1977 12.20%
1978 15.02%
1979 22.96%
1980 24.00%
1981 13.64%
1982 12.36%
1983 25.94%
1984 31.32%
1985 19.78%
1986 15.88%
1987 14.60%
1988 20.54%
1989 10.58%
1990 10.94%
1991 11.86%
1992 24.50%
1993 21.26%
1994 36.28%
1995 18.18%
1996 27.82%
1997 11.22%
1998 18.10%
1999 16.08%
2000 30.04%
2001 11.30%
2002 51.26%
2003 39.82%
2004 11.62%
2005 13.48%
2006 41.78%
2007 47.06%
2008 18.88%
2009 3.54%
2010 11.40%
2011 38.50%
2012 56.66%
2013 39.16%
2014 19.84%

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.