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 22.52%
1911 26.00%
1912 33.82%
1913 18.00%
1914 19.00%
1915 22.08%
1916 28.70%
1917 32.78%
1918 11.48%
1919 19.94%
1920 19.10%
1921 27.12%
1922 18.24%
1923 17.78%
1924 31.28%
1925 14.42%
1926 18.20%
1927 20.34%
1928 12.08%
1929 26.80%
1930 14.06%
1931 29.40%
1932 13.28%
1933 22.22%
1934 39.54%
1935 13.40%
1936 18.42%
1937 14.04%
1938 18.32%
1939 19.40%
1940 23.96%
1941 31.08%
1942 13.16%
1943 11.26%
1944 11.92%
1945 11.12%
1946 15.04%
1947 8.96%
1948 16.58%
1949 16.70%
1950 24.28%
1951 24.68%
1952 13.52%
1953 22.26%
1954 29.50%
1955 19.52%
1956 19.26%
1957 15.36%
1958 23.92%
1959 12.64%
1960 13.78%
1961 13.72%
1962 7.84%
1963 17.86%
1964 17.94%
1965 15.22%
1966 16.80%
1967 7.90%
1968 14.88%
1969 12.02%
1970 8.02%
1971 11.16%
1972 14.64%
1973 21.56%
1974 11.40%
1975 18.22%
1976 21.80%
1977 10.02%
1978 20.26%
1979 26.04%
1980 10.96%
1981 20.90%
1982 19.34%
1983 28.56%
1984 16.34%
1985 19.06%
1986 19.64%
1987 22.14%
1988 16.82%
1989 20.30%
1990 24.40%
1991 19.58%
1992 21.60%
1993 24.88%
1994 14.32%
1995 18.12%
1996 32.66%
1997 19.56%
1998 42.54%
1999 28.38%
2000 18.84%
2001 22.80%
2002 21.12%
2003 26.12%
2004 19.76%
2005 22.48%
2006 34.28%
2007 32.10%
2008 20.52%
2009 16.48%
2010 24.14%
2011 28.96%
2012 49.40%
2013 22.36%

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.