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 33.82%
1911 18.88%
1912 38.56%
1913 15.80%
1914 15.88%
1915 7.06%
1916 29.82%
1917 46.88%
1918 10.38%
1919 7.56%
1920 9.10%
1921 35.72%
1922 9.38%
1923 16.56%
1924 37.88%
1925 7.86%
1926 25.34%
1927 11.10%
1928 8.64%
1929 31.20%
1930 12.74%
1931 58.44%
1932 8.54%
1933 19.68%
1934 36.08%
1935 9.66%
1936 20.70%
1937 14.30%
1938 20.40%
1939 17.66%
1940 12.66%
1941 21.58%
1942 5.96%
1943 8.36%
1944 6.68%
1945 8.96%
1946 10.54%
1947 3.30%
1948 11.02%
1949 14.44%
1950 47.36%
1951 55.00%
1952 15.30%
1953 17.44%
1954 9.70%
1955 8.58%
1956 13.08%
1957 9.76%
1958 13.38%
1959 10.34%
1960 17.64%
1961 12.24%
1962 4.80%
1963 15.50%
1964 15.66%
1965 17.64%
1966 16.62%
1967 8.44%
1968 13.16%
1969 6.36%
1970 4.74%
1971 8.94%
1972 36.74%
1973 26.44%
1974 4.70%
1975 8.56%
1976 25.64%
1977 14.90%
1978 25.68%
1979 35.86%
1980 13.56%
1981 18.96%
1982 18.22%
1983 21.76%
1984 16.34%
1985 21.32%
1986 22.78%
1987 44.36%
1988 21.12%
1989 21.34%
1990 22.72%
1991 19.28%
1992 6.52%
1993 40.00%
1994 14.60%
1995 8.98%
1996 37.16%
1997 9.72%
1998 52.36%
1999 46.94%
2000 13.02%
2001 28.50%
2002 18.32%
2003 5.68%
2004 12.24%
2005 29.70%
2006 43.26%
2007 23.92%
2008 29.40%
2009 21.28%
2010 53.26%
2011 13.58%
2012 52.24%
2013 18.60%

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.