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 22.02%
1911 24.64%
1912 21.54%
1913 10.54%
1914 18.66%
1915 19.62%
1916 22.86%
1917 29.30%
1918 11.34%
1919 29.12%
1920 14.06%
1921 18.90%
1922 15.92%
1923 17.78%
1924 17.84%
1925 20.36%
1926 16.04%
1927 24.20%
1928 9.34%
1929 26.52%
1930 16.58%
1931 36.56%
1932 20.34%
1933 26.60%
1934 18.86%
1935 12.42%
1936 20.46%
1937 20.94%
1938 18.64%
1939 22.42%
1940 12.22%
1941 31.30%
1942 10.32%
1943 18.98%
1944 8.68%
1945 10.76%
1946 20.74%
1947 14.20%
1948 13.80%
1949 7.40%
1950 18.56%
1951 20.72%
1952 30.36%
1953 33.54%
1954 23.12%
1955 14.52%
1956 21.08%
1957 21.96%
1958 11.58%
1959 22.26%
1960 7.54%
1961 21.14%
1962 11.48%
1963 38.52%
1964 13.26%
1965 12.48%
1966 7.94%
1967 18.50%
1968 8.52%
1969 6.78%
1970 12.96%
1971 18.18%
1972 24.32%
1973 25.08%
1974 17.28%
1975 10.68%
1976 33.80%
1977 15.24%
1978 11.28%
1979 16.76%
1980 9.84%
1981 12.16%
1982 15.98%
1983 19.40%
1984 17.00%
1985 38.70%
1986 24.38%
1987 15.42%
1988 14.50%
1989 13.74%
1990 17.82%
1991 16.94%
1992 13.56%
1993 24.52%
1994 13.78%
1995 23.68%
1996 23.84%
1997 13.12%
1998 34.04%
1999 27.48%
2000 11.26%
2001 24.56%
2002 17.82%
2003 17.32%
2004 27.40%
2005 25.02%
2006 12.12%
2007 25.94%
2008 17.08%
2009 19.60%
2010 18.14%
2011 22.36%
2012 23.06%
2013 12.12%
2014 17.92%

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.