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 51.04%
1911 24.32%
1912 32.82%
1913 12.94%
1914 11.28%
1915 21.70%
1916 21.48%
1917 46.44%
1918 9.72%
1919 12.12%
1920 33.82%
1921 8.80%
1922 13.42%
1923 15.38%
1924 26.70%
1925 17.36%
1926 15.94%
1927 18.92%
1928 20.26%
1929 16.68%
1930 8.40%
1931 7.86%
1932 6.64%
1933 6.72%
1934 55.54%
1935 31.76%
1936 14.38%
1937 17.92%
1938 13.60%
1939 18.72%
1940 16.32%
1941 18.64%
1942 13.98%
1943 15.24%
1944 13.74%
1945 9.94%
1946 26.80%
1947 13.92%
1948 11.44%
1949 8.58%
1950 31.08%
1951 29.74%
1952 14.70%
1953 8.00%
1954 14.40%
1955 32.64%
1956 12.76%
1957 13.64%
1958 10.92%
1959 7.22%
1960 13.82%
1961 16.26%
1962 9.88%
1963 3.72%
1964 13.20%
1965 33.60%
1966 9.56%
1967 13.20%
1968 2.78%
1969 11.20%
1970 18.74%
1971 7.84%
1972 11.64%
1973 16.76%
1974 9.02%
1975 32.84%
1976 9.26%
1977 29.00%
1978 8.60%
1979 12.36%
1980 17.82%
1981 32.74%
1982 11.30%
1983 20.04%
1984 14.26%
1985 31.00%
1986 24.36%
1987 41.70%
1988 24.52%
1989 17.54%
1990 14.14%
1991 20.42%
1992 34.10%
1993 12.12%
1994 33.58%
1995 28.70%
1996 36.34%
1997 14.74%
1998 10.02%
1999 19.14%
2000 23.24%
2001 22.52%
2002 31.70%
2003 9.08%
2004 33.82%
2005 13.16%
2006 11.88%
2007 39.80%
2008 15.40%
2009 13.16%
2010 24.16%
2011 41.28%
2012 38.98%
2013 31.26%

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.