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 19.80%
1911 29.90%
1912 37.42%
1913 21.14%
1914 17.02%
1915 24.38%
1916 25.48%
1917 33.80%
1918 14.76%
1919 18.56%
1920 18.22%
1921 26.38%
1922 16.86%
1923 18.18%
1924 30.76%
1925 16.08%
1926 17.98%
1927 17.84%
1928 11.62%
1929 24.32%
1930 12.60%
1931 27.54%
1932 12.60%
1933 18.70%
1934 42.08%
1935 12.82%
1936 17.60%
1937 15.00%
1938 19.66%
1939 14.86%
1940 28.78%
1941 26.64%
1942 15.94%
1943 12.30%
1944 12.54%
1945 11.06%
1946 12.02%
1947 9.26%
1948 14.14%
1949 24.52%
1950 21.98%
1951 21.26%
1952 12.38%
1953 19.64%
1954 29.80%
1955 19.84%
1956 18.28%
1957 15.68%
1958 23.52%
1959 10.90%
1960 12.40%
1961 14.74%
1962 9.18%
1963 18.44%
1964 19.62%
1965 19.18%
1966 20.18%
1967 9.16%
1968 13.76%
1969 11.78%
1970 9.94%
1971 11.28%
1972 12.82%
1973 23.90%
1974 11.72%
1975 21.54%
1976 13.96%
1977 10.78%
1978 24.40%
1979 28.56%
1980 11.00%
1981 15.54%
1982 20.50%
1983 26.92%
1984 17.36%
1985 11.92%
1986 20.30%
1987 18.86%
1988 22.78%
1989 14.78%
1990 21.34%
1991 20.38%
1992 21.88%
1993 25.16%
1994 17.76%
1995 16.48%
1996 22.40%
1997 18.60%
1998 39.48%
1999 18.76%
2000 31.96%
2001 16.96%
2002 24.24%
2003 29.24%
2004 17.64%
2005 22.16%
2006 28.92%
2007 31.88%
2008 18.82%
2009 18.12%
2010 24.12%
2011 32.44%
2012 46.88%
2013 20.94%
2014 32.66%

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.