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 17.82%
1911 19.07%
1912 22.83%
1913 17.43%
1914 16.10%
1915 38.07%
1916 27.50%
1917 18.75%
1918 19.62%
1919 20.50%
1920 15.67%
1921 18.95%
1922 10.32%
1923 14.33%
1924 20.07%
1925 13.98%
1926 16.42%
1927 21.62%
1928 22.50%
1929 15.02%
1930 16.40%
1931 21.80%
1932 15.92%
1933 22.97%
1934 32.90%
1935 8.15%
1936 36.97%
1937 14.72%
1938 10.22%
1939 12.33%
1940 19.58%
1941 18.82%
1942 16.63%
1943 20.00%
1944 17.18%
1945 20.03%
1946 11.68%
1947 14.30%
1948 10.08%
1949 18.80%
1950 23.82%
1951 18.70%
1952 18.32%
1953 20.35%
1954 27.42%
1955 19.18%
1956 13.80%
1957 16.85%
1958 16.83%
1959 13.82%
1960 12.03%
1961 21.27%
1962 7.92%
1963 12.32%
1964 15.95%
1965 17.68%
1966 13.00%
1967 20.78%
1968 12.68%
1969 15.37%
1970 16.18%
1971 7.73%
1972 16.33%
1973 14.05%
1974 12.82%
1975 12.83%
1976 23.22%
1977 9.70%
1978 11.42%
1979 14.98%
1980 25.58%
1981 14.90%
1982 11.80%
1983 26.52%
1984 13.63%
1985 17.70%
1986 13.08%
1987 11.02%
1988 24.53%
1989 18.08%
1990 9.48%
1991 20.58%
1992 41.27%
1993 31.33%
1994 17.45%
1995 25.00%
1996 17.82%
1997 15.62%
1998 22.93%
1999 17.75%
2000 15.60%
2001 15.93%
2002 23.08%
2003 25.52%
2004 33.05%
2005 33.42%
2006 26.42%
2007 29.83%
2008 20.97%
2009 18.40%
2010 24.08%
2011 38.50%
2012 30.10%
2013 23.25%

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.