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 25.60%
1911 28.00%
1912 34.56%
1913 11.78%
1914 19.58%
1915 30.48%
1916 18.94%
1917 40.32%
1918 17.52%
1919 27.50%
1920 19.12%
1921 36.58%
1922 10.38%
1923 17.34%
1924 28.12%
1925 21.48%
1926 6.14%
1927 22.60%
1928 8.16%
1929 19.18%
1930 7.24%
1931 16.26%
1932 10.48%
1933 35.68%
1934 37.88%
1935 17.06%
1936 23.28%
1937 7.88%
1938 28.06%
1939 19.44%
1940 21.98%
1941 37.46%
1942 18.68%
1943 13.94%
1944 6.78%
1945 17.16%
1946 22.48%
1947 5.36%
1948 7.32%
1949 16.08%
1950 13.94%
1951 25.18%
1952 19.10%
1953 24.36%
1954 52.54%
1955 17.80%
1956 35.34%
1957 25.00%
1958 26.98%
1959 8.68%
1960 18.18%
1961 27.84%
1962 5.62%
1963 24.38%
1964 10.94%
1965 8.70%
1966 20.42%
1967 6.36%
1968 31.50%
1969 10.80%
1970 6.56%
1971 5.68%
1972 5.10%
1973 30.40%
1974 19.72%
1975 16.28%
1976 27.22%
1977 6.64%
1978 13.98%
1979 41.80%
1980 9.50%
1981 14.10%
1982 7.10%
1983 30.42%
1984 6.08%
1985 18.26%
1986 23.94%
1987 17.20%
1988 9.28%
1989 21.96%
1990 13.40%
1991 25.34%
1992 23.72%
1993 27.32%
1994 9.84%
1995 11.90%
1996 13.84%
1997 18.50%
1998 41.06%
1999 31.92%
2000 20.02%
2001 17.96%
2002 10.16%
2003 12.66%
2004 20.32%
2005 17.52%
2006 40.66%
2007 25.60%
2008 19.18%
2009 20.06%
2010 13.52%
2011 39.76%
2012 55.54%
2013 16.40%

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.