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 39.86%
1911 13.26%
1912 33.38%
1913 18.46%
1914 14.98%
1915 27.20%
1916 19.66%
1917 46.36%
1918 13.64%
1919 16.40%
1920 33.92%
1921 7.62%
1922 24.76%
1923 14.06%
1924 18.22%
1925 24.48%
1926 24.96%
1927 11.34%
1928 11.28%
1929 13.46%
1930 3.56%
1931 8.58%
1932 10.60%
1933 23.92%
1934 51.30%
1935 13.54%
1936 16.28%
1937 6.60%
1938 9.02%
1939 6.80%
1940 15.72%
1941 39.76%
1942 29.44%
1943 9.82%
1944 18.26%
1945 9.92%
1946 5.48%
1947 10.20%
1948 12.96%
1949 1.60%
1950 12.00%
1951 9.32%
1952 13.46%
1953 9.20%
1954 13.52%
1955 23.76%
1956 15.92%
1957 22.52%
1958 21.64%
1959 10.40%
1960 5.52%
1961 6.60%
1962 3.16%
1963 10.62%
1964 19.26%
1965 20.56%
1966 20.32%
1967 11.56%
1968 5.30%
1969 5.34%
1970 15.06%
1971 15.78%
1972 32.94%
1973 38.40%
1974 17.26%
1975 32.26%
1976 0.58%
1977 13.98%
1978 11.92%
1979 14.22%
1980 21.72%
1981 8.48%
1982 2.68%
1983 35.90%
1984 14.68%
1985 20.28%
1986 12.82%
1987 15.68%
1988 8.50%
1989 41.82%
1990 17.92%
1991 13.62%
1992 41.84%
1993 11.52%
1994 13.74%
1995 13.62%
1996 35.20%
1997 12.48%
1998 12.96%
1999 8.12%
2000 42.54%
2001 18.36%
2002 37.14%
2003 14.82%
2004 46.16%
2005 16.28%
2006 24.50%
2007 27.60%
2008 14.12%
2009 12.16%
2010 9.24%
2011 23.86%
2012 49.80%
2013 30.50%

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.