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 13.86%
1911 33.96%
1912 30.20%
1913 35.76%
1914 9.44%
1915 4.40%
1916 47.70%
1917 14.24%
1918 7.78%
1919 34.54%
1920 17.08%
1921 11.86%
1922 36.58%
1923 14.56%
1924 23.44%
1925 20.24%
1926 25.20%
1927 11.90%
1928 10.84%
1929 52.16%
1930 29.32%
1931 18.54%
1932 11.68%
1933 19.94%
1934 55.22%
1935 31.14%
1936 19.94%
1937 19.26%
1938 5.28%
1939 27.90%
1940 34.02%
1941 25.76%
1942 11.88%
1943 12.00%
1944 16.24%
1945 8.74%
1946 5.56%
1947 8.04%
1948 52.12%
1949 23.32%
1950 24.22%
1951 13.18%
1952 14.92%
1953 17.84%
1954 13.00%
1955 38.54%
1956 14.30%
1957 6.18%
1958 34.14%
1959 13.12%
1960 0.90%
1961 6.18%
1962 4.32%
1963 4.96%
1964 31.26%
1965 16.02%
1966 13.36%
1967 12.38%
1968 6.24%
1969 4.68%
1970 10.82%
1971 23.16%
1972 6.64%
1973 4.58%
1974 10.90%
1975 26.40%
1976 8.46%
1977 10.78%
1978 3.88%
1979 6.90%
1980 17.38%
1981 23.96%
1982 33.60%
1983 40.98%
1984 40.10%
1985 33.74%
1986 8.34%
1987 37.86%
1988 15.10%
1989 3.92%
1990 21.64%
1991 6.88%
1992 47.58%
1993 16.60%
1994 23.08%
1995 39.20%
1996 49.36%
1997 36.98%
1998 50.80%
1999 11.06%
2000 8.56%
2001 19.78%
2002 16.74%
2003 43.06%
2004 27.76%
2005 12.92%
2006 24.82%
2007 18.14%
2008 4.72%
2009 9.30%
2010 26.52%
2011 12.84%
2012 31.22%
2013 8.08%

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.