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 18.14%
1911 27.18%
1912 34.98%
1913 19.04%
1914 18.16%
1915 24.98%
1916 22.84%
1917 31.90%
1918 14.90%
1919 17.72%
1920 25.44%
1921 24.84%
1922 17.68%
1923 14.94%
1924 28.82%
1925 20.86%
1926 19.50%
1927 19.00%
1928 11.04%
1929 24.92%
1930 12.16%
1931 26.24%
1932 12.20%
1933 17.76%
1934 41.74%
1935 12.52%
1936 17.92%
1937 19.60%
1938 16.96%
1939 11.40%
1940 31.50%
1941 24.14%
1942 16.38%
1943 16.22%
1944 16.06%
1945 9.50%
1946 11.38%
1947 9.92%
1948 15.44%
1949 23.74%
1950 22.80%
1951 18.64%
1952 14.48%
1953 16.92%
1954 25.46%
1955 21.68%
1956 13.52%
1957 14.56%
1958 23.80%
1959 9.78%
1960 17.66%
1961 18.40%
1962 7.78%
1963 12.44%
1964 18.18%
1965 16.08%
1966 15.22%
1967 8.60%
1968 12.56%
1969 10.02%
1970 10.90%
1971 15.36%
1972 12.74%
1973 26.06%
1974 14.02%
1975 21.32%
1976 11.50%
1977 11.88%
1978 27.06%
1979 32.56%
1980 10.58%
1981 18.42%
1982 18.08%
1983 27.26%
1984 18.52%
1985 12.40%
1986 20.66%
1987 20.98%
1988 21.34%
1989 12.90%
1990 21.04%
1991 24.28%
1992 23.52%
1993 26.44%
1994 17.92%
1995 16.02%
1996 22.62%
1997 16.70%
1998 33.04%
1999 24.80%
2000 31.70%
2001 15.34%
2002 23.60%
2003 24.42%
2004 15.74%
2005 19.26%
2006 39.08%
2007 32.66%
2008 18.04%
2009 14.52%
2010 22.18%
2011 36.40%
2012 46.86%
2013 21.52%
2014 31.78%

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.