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 31.82%
1911 19.62%
1912 23.70%
1913 13.92%
1914 14.94%
1915 22.42%
1916 17.34%
1917 32.34%
1918 19.26%
1919 9.44%
1920 22.92%
1921 18.64%
1922 18.08%
1923 17.82%
1924 27.60%
1925 23.30%
1926 31.28%
1927 18.26%
1928 14.88%
1929 18.34%
1930 7.62%
1931 27.06%
1932 10.36%
1933 12.42%
1934 38.32%
1935 17.86%
1936 14.94%
1937 9.32%
1938 15.58%
1939 13.12%
1940 20.88%
1941 25.36%
1942 18.56%
1943 14.20%
1944 12.64%
1945 17.90%
1946 17.38%
1947 22.70%
1948 16.60%
1949 6.02%
1950 20.62%
1951 17.36%
1952 13.02%
1953 12.12%
1954 14.02%
1955 28.40%
1956 18.18%
1957 17.60%
1958 20.10%
1959 8.22%
1960 22.40%
1961 11.76%
1962 7.28%
1963 14.68%
1964 16.74%
1965 16.60%
1966 12.98%
1967 19.50%
1968 7.58%
1969 12.66%
1970 11.88%
1971 18.08%
1972 15.26%
1973 28.02%
1974 18.62%
1975 24.26%
1976 9.20%
1977 29.72%
1978 10.12%
1979 13.34%
1980 16.34%
1981 13.24%
1982 8.78%
1983 33.80%
1984 22.10%
1985 23.64%
1986 19.12%
1987 27.80%
1988 14.82%
1989 17.90%
1990 14.50%
1991 30.32%
1992 27.16%
1993 21.28%
1994 16.86%
1995 19.06%
1996 25.62%
1997 18.80%
1998 22.10%
1999 12.66%
2000 26.92%
2001 15.60%
2002 21.04%
2003 14.52%
2004 33.40%
2005 14.60%
2006 24.66%
2007 31.26%
2008 15.24%
2009 12.84%
2010 22.66%
2011 36.22%
2012 43.58%
2013 28.14%
2014 20.48%

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.