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 17.56%
1911 17.74%
1912 23.28%
1913 13.38%
1914 10.86%
1915 56.78%
1916 28.28%
1917 22.22%
1918 9.70%
1919 38.10%
1920 12.92%
1921 14.50%
1922 11.68%
1923 17.26%
1924 29.54%
1925 9.36%
1926 11.04%
1927 31.26%
1928 39.34%
1929 12.48%
1930 14.06%
1931 34.00%
1932 10.20%
1933 32.60%
1934 32.92%
1935 11.20%
1936 59.16%
1937 28.26%
1938 10.98%
1939 11.30%
1940 24.68%
1941 14.96%
1942 14.90%
1943 11.38%
1944 28.42%
1945 24.10%
1946 6.00%
1947 14.48%
1948 11.42%
1949 6.10%
1950 32.32%
1951 40.32%
1952 9.70%
1953 12.82%
1954 9.42%
1955 7.90%
1956 12.70%
1957 7.68%
1958 17.06%
1959 12.72%
1960 7.34%
1961 36.06%
1962 16.68%
1963 11.08%
1964 9.76%
1965 16.00%
1966 5.72%
1967 21.10%
1968 13.76%
1969 11.52%
1970 24.50%
1971 5.12%
1972 7.20%
1973 12.16%
1974 7.72%
1975 14.28%
1976 18.50%
1977 8.96%
1978 14.00%
1979 7.86%
1980 15.22%
1981 12.82%
1982 11.62%
1983 23.64%
1984 15.62%
1985 12.04%
1986 7.14%
1987 6.36%
1988 54.86%
1989 17.32%
1990 5.86%
1991 16.46%
1992 36.82%
1993 58.86%
1994 13.58%
1995 20.86%
1996 12.48%
1997 14.26%
1998 16.70%
1999 16.12%
2000 15.74%
2001 26.84%
2002 25.16%
2003 22.94%
2004 29.12%
2005 13.46%
2006 34.12%
2007 42.66%
2008 13.86%
2009 28.12%
2010 27.04%
2011 30.50%
2012 41.38%
2013 24.60%

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.