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 22.40%
1911 26.66%
1912 33.76%
1913 18.22%
1914 19.18%
1915 21.74%
1916 28.26%
1917 32.36%
1918 11.34%
1919 20.24%
1920 19.28%
1921 26.90%
1922 18.22%
1923 17.90%
1924 30.88%
1925 14.30%
1926 17.90%
1927 20.56%
1928 11.64%
1929 26.62%
1930 14.24%
1931 29.14%
1932 13.40%
1933 21.96%
1934 39.32%
1935 13.30%
1936 18.46%
1937 13.58%
1938 18.38%
1939 19.20%
1940 23.08%
1941 30.60%
1942 13.10%
1943 11.36%
1944 11.80%
1945 10.94%
1946 14.78%
1947 9.16%
1948 16.56%
1949 16.50%
1950 23.98%
1951 24.36%
1952 13.52%
1953 21.96%
1954 29.60%
1955 19.52%
1956 19.18%
1957 15.34%
1958 23.60%
1959 12.52%
1960 13.38%
1961 13.40%
1962 7.86%
1963 17.72%
1964 17.78%
1965 14.86%
1966 16.64%
1967 7.88%
1968 14.76%
1969 11.76%
1970 8.32%
1971 10.60%
1972 14.36%
1973 21.34%
1974 11.52%
1975 18.18%
1976 21.16%
1977 10.00%
1978 19.98%
1979 25.12%
1980 10.82%
1981 20.52%
1982 19.08%
1983 28.56%
1984 16.26%
1985 18.94%
1986 19.20%
1987 21.96%
1988 16.88%
1989 19.46%
1990 24.46%
1991 19.16%
1992 20.78%
1993 24.24%
1994 13.88%
1995 17.78%
1996 31.50%
1997 18.90%
1998 41.70%
1999 28.10%
2000 17.70%
2001 22.26%
2002 20.84%
2003 25.18%
2004 19.06%
2005 22.70%
2006 33.98%
2007 31.56%
2008 19.88%
2009 16.16%
2010 23.70%
2011 28.84%
2012 48.92%
2013 22.26%
2014 31.42%

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.