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 16.70%
1911 19.26%
1912 35.10%
1913 16.58%
1914 11.10%
1915 32.56%
1916 11.98%
1917 22.82%
1918 18.40%
1919 7.92%
1920 12.54%
1921 23.50%
1922 24.04%
1923 27.42%
1924 32.24%
1925 17.44%
1926 26.66%
1927 46.10%
1928 20.74%
1929 29.66%
1930 16.90%
1931 13.82%
1932 10.24%
1933 20.66%
1934 22.54%
1935 3.94%
1936 19.58%
1937 21.58%
1938 15.12%
1939 7.22%
1940 3.98%
1941 14.12%
1942 7.88%
1943 13.60%
1944 19.42%
1945 15.80%
1946 28.20%
1947 12.48%
1948 3.56%
1949 59.06%
1950 14.84%
1951 5.48%
1952 22.52%
1953 24.50%
1954 23.70%
1955 40.44%
1956 14.40%
1957 20.46%
1958 24.58%
1959 18.04%
1960 7.94%
1961 6.08%
1962 14.24%
1963 12.94%
1964 16.80%
1965 32.64%
1966 29.72%
1967 5.16%
1968 3.68%
1969 3.18%
1970 5.30%
1971 11.14%
1972 37.40%
1973 39.72%
1974 10.28%
1975 16.44%
1976 15.48%
1977 8.76%
1978 6.44%
1979 10.70%
1980 5.70%
1981 6.38%
1982 22.94%
1983 16.58%
1984 8.04%
1985 14.72%
1986 17.80%
1987 6.68%
1988 17.90%
1989 16.44%
1990 10.14%
1991 25.42%
1992 27.92%
1993 2.92%
1994 19.74%
1995 41.42%
1996 14.24%
1997 7.78%
1998 11.14%
1999 31.42%
2000 24.42%
2001 13.96%
2002 27.72%
2003 23.64%
2004 30.54%
2005 52.20%
2006 41.06%
2007 10.28%
2008 25.16%
2009 38.58%
2010 33.34%
2011 51.50%
2012 27.70%
2013 26.02%
2014 12.46%

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.